Isolate/Thread split: Isolate -> Zone for LocationSummary.

runtime/vm/intermediate_language_ia32.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 14 matching lines @@
 DECLARE_FLAG(bool, emit_edge_counters);
 DECLARE_FLAG(bool, enable_asserts);
 DECLARE_FLAG(bool, enable_type_checks);
 DECLARE_FLAG(int, optimization_counter_threshold);
 DECLARE_FLAG(bool, propagate_ic_data);
 DECLARE_FLAG(bool, use_osr);
 DECLARE_FLAG(bool, throw_on_javascript_int_overflow);
 
 // Generic summary for call instructions that have all arguments pushed
 // on the stack and return the result in a fixed register EAX.
-LocationSummary* Instruction::MakeCallSummary(Isolate* isolate) {
+LocationSummary* Instruction::MakeCallSummary(Zone* zone) {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 0;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   result->set_out(0, Location::RegisterLocation(EAX));
   return result;
 }
 
 
-LocationSummary* PushArgumentInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* PushArgumentInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::AnyOrConstant(value()));
   return locs;
 }
 
 
 void PushArgumentInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // In SSA mode, we need an explicit push. Nothing to do in non-SSA mode
   // where PushArgument is handled by BindInstr::EmitNativeCode.
   if (compiler->is_optimizing()) {
     Location value = locs()->in(0);
     if (value.IsRegister()) {
       __ pushl(value.reg());
     } else if (value.IsConstant()) {
       __ PushObject(value.constant());
     } else {
       ASSERT(value.IsStackSlot());
       __ pushl(value.ToStackSlotAddress());
     }
   }
 }
 
 
-LocationSummary* ReturnInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* ReturnInstr::MakeLocationSummary(Zone* zone,
                                                   bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::RegisterLocation(EAX));
   return locs;
 }
 
 
 // Attempt optimized compilation at return instruction instead of at the entry.
 // The entry needs to be patchable, no inlined objects are allowed in the area
 // that will be overwritten by the patch instruction: a jump).
 void ReturnInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register result = locs()->in(0).reg();
@@ skipping 16 matching lines @@
   __ cmpl(EDI, Immediate(fp_sp_dist));
   __ j(EQUAL, &done, Assembler::kNearJump);
   __ int3();
   __ Bind(&done);
 #endif
   __ LeaveFrame();
   __ ret();
 }
 
 
-LocationSummary* LoadLocalInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* LoadLocalInstr::MakeLocationSummary(Zone* zone,
                                                      bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t stack_index = (local().index() < 0)
       ? kFirstLocalSlotFromFp - local().index()
       : kParamEndSlotFromFp - local().index();
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                kNumInputs,
                                Location::StackSlot(stack_index),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadLocalInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(!compiler->is_optimizing());
   // Nothing to do.
 }
 
 
-LocationSummary* StoreLocalInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* StoreLocalInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
   const intptr_t kNumInputs = 1;
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                kNumInputs,
                                Location::SameAsFirstInput(),
                                LocationSummary::kNoCall);
 }
 
 
 void StoreLocalInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   Register result = locs()->out(0).reg();
   ASSERT(result == value);  // Assert that register assignment is correct.
   __ movl(Address(EBP, local().index() * kWordSize), value);
 }
 
 
-LocationSummary* ConstantInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* ConstantInstr::MakeLocationSummary(Zone* zone,
                                                     bool opt) const {
   const intptr_t kNumInputs = 0;
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void ConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // The register allocator drops constant definitions that have no uses.
   if (!locs()->out(0).IsInvalid()) {
     Register result = locs()->out(0).reg();
     __ LoadObjectSafely(result, value());
   }
 }
 
 
-LocationSummary* UnboxedConstantInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnboxedConstantInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps =
       (constant_address() == 0) && (representation() != kUnboxedInt32) ? 1 : 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   if (representation() == kUnboxedDouble) {
     locs->set_out(0, Location::RequiresFpuRegister());
   } else {
     ASSERT(representation() == kUnboxedInt32);
     locs->set_out(0, Location::RequiresRegister());
   }
   if (kNumTemps == 1) {
     locs->set_temp(0, Location::RequiresRegister());
   }
   return locs;
@@ skipping 20 matching lines @@
       case kUnboxedInt32:
         __ movl(locs()->out(0).reg(), Immediate(Smi::Cast(value()).Value()));
         break;
       default:
         UNREACHABLE();
     }
   }
 }
 
 
-LocationSummary* AssertAssignableInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* AssertAssignableInstr::MakeLocationSummary(Zone* zone,
                                                             bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   summary->set_in(0, Location::RegisterLocation(EAX));  // Value.
   summary->set_in(1, Location::RegisterLocation(ECX));  // Instantiator.
   summary->set_in(2, Location::RegisterLocation(EDX));  // Type arguments.
   summary->set_out(0, Location::RegisterLocation(EAX));
   return summary;
 }
 
 
-LocationSummary* AssertBooleanInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* AssertBooleanInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(EAX));
   locs->set_out(0, Location::RegisterLocation(EAX));
   return locs;
 }
 
 
 static void EmitAssertBoolean(Register reg,
                               intptr_t token_pos,
                               intptr_t deopt_id,
                               LocationSummary* locs,
@@ skipping 43 matching lines @@
     case Token::kGT: return GREATER;
     case Token::kLTE: return LESS_EQUAL;
     case Token::kGTE: return GREATER_EQUAL;
     default:
       UNREACHABLE();
       return OVERFLOW;
   }
 }
 
 
-LocationSummary* EqualityCompareInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* EqualityCompareInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 2;
   if (operation_cid() == kMintCid) {
     const intptr_t kNumTemps = 0;
-    LocationSummary* locs = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* locs = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     locs->set_in(0, Location::Pair(Location::RequiresRegister(),
                                    Location::RequiresRegister()));
     locs->set_in(1, Location::Pair(Location::RequiresRegister(),
                                    Location::RequiresRegister()));
     locs->set_out(0, Location::RequiresRegister());
     return locs;
   }
   if (operation_cid() == kDoubleCid) {
     const intptr_t kNumTemps = 0;
-    LocationSummary* locs = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* locs = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     locs->set_in(0, Location::RequiresFpuRegister());
     locs->set_in(1, Location::RequiresFpuRegister());
     locs->set_out(0, Location::RequiresRegister());
     return locs;
   }
   if (operation_cid() == kSmiCid) {
     const intptr_t kNumTemps = 0;
-    LocationSummary* locs = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* locs = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     locs->set_in(0, Location::RegisterOrConstant(left()));
     // Only one input can be a constant operand. The case of two constant
     // operands should be handled by constant propagation.
     // Only right can be a stack slot.
     locs->set_in(1, locs->in(0).IsConstant()
                         ? Location::RequiresRegister()
                         : Location::RegisterOrConstant(right()));
     locs->set_out(0, Location::RequiresRegister());
     return locs;
   }
@@ skipping 272 matching lines @@
 void EqualityCompareInstr::EmitBranchCode(FlowGraphCompiler* compiler,
                                           BranchInstr* branch) {
   ASSERT((kind() == Token::kNE) || (kind() == Token::kEQ));
 
   BranchLabels labels = compiler->CreateBranchLabels(branch);
   Condition true_condition = EmitComparisonCode(compiler, labels);
   EmitBranchOnCondition(compiler, true_condition, labels);
 }
 
 
-LocationSummary* TestSmiInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* TestSmiInstr::MakeLocationSummary(Zone* zone,
                                                    bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::RequiresRegister());
   // Only one input can be a constant operand. The case of two constant
   // operands should be handled by constant propagation.
   locs->set_in(1, Location::RegisterOrConstant(right()));
   return locs;
 }
 
 
 Condition TestSmiInstr::EmitComparisonCode(FlowGraphCompiler* compiler,
                                            BranchLabels labels) {
@@ skipping 20 matching lines @@
 
 void TestSmiInstr::EmitBranchCode(FlowGraphCompiler* compiler,
                                   BranchInstr* branch) {
   BranchLabels labels = compiler->CreateBranchLabels(branch);
   Condition true_condition = EmitComparisonCode(compiler, labels);
   EmitBranchOnCondition(compiler, true_condition, labels);
 }
 
 
 
-LocationSummary* TestCidsInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* TestCidsInstr::MakeLocationSummary(Zone* zone,
                                                     bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 1;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::RequiresRegister());
   locs->set_temp(0, Location::RequiresRegister());
   locs->set_out(0, Location::RequiresRegister());
   return locs;
 }
 
 
 Condition TestCidsInstr::EmitComparisonCode(FlowGraphCompiler* compiler,
                                             BranchLabels labels) {
   ASSERT((kind() == Token::kIS) || (kind() == Token::kISNOT));
@@ skipping 46 matching lines @@
   EmitComparisonCode(compiler, labels);
   __ Bind(&is_false);
   __ LoadObject(result_reg, Bool::False());
   __ jmp(&done, Assembler::kNearJump);
   __ Bind(&is_true);
   __ LoadObject(result_reg, Bool::True());
   __ Bind(&done);
 }
 
 
-LocationSummary* RelationalOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* RelationalOpInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   if (operation_cid() == kMintCid) {
     const intptr_t kNumTemps = 0;
-    LocationSummary* locs = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* locs = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     locs->set_in(0, Location::Pair(Location::RequiresRegister(),
                                    Location::RequiresRegister()));
     locs->set_in(1, Location::Pair(Location::RequiresRegister(),
                                    Location::RequiresRegister()));
     locs->set_out(0, Location::RequiresRegister());
     return locs;
   }
   if (operation_cid() == kDoubleCid) {
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresFpuRegister());
     summary->set_in(1, Location::RequiresFpuRegister());
     summary->set_out(0, Location::RequiresRegister());
     return summary;
   }
   ASSERT(operation_cid() == kSmiCid);
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RegisterOrConstant(left()));
   // Only one input can be a constant operand. The case of two constant
   // operands should be handled by constant propagation.
   summary->set_in(1, summary->in(0).IsConstant()
                          ? Location::RequiresRegister()
                          : Location::RegisterOrConstant(right()));
   summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
@@ skipping 29 matching lines @@
 
 
 void RelationalOpInstr::EmitBranchCode(FlowGraphCompiler* compiler,
                                        BranchInstr* branch) {
   BranchLabels labels = compiler->CreateBranchLabels(branch);
   Condition true_condition = EmitComparisonCode(compiler, labels);
   EmitBranchOnCondition(compiler, true_condition, labels);
 }
 
 
-LocationSummary* NativeCallInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* NativeCallInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
-  return MakeCallSummary(isolate);
+  return MakeCallSummary(zone);
 }
 
 
 void NativeCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register result = locs()->out(0).reg();
   const intptr_t argc_tag = NativeArguments::ComputeArgcTag(function());
   const bool is_leaf_call =
       (argc_tag & NativeArguments::AutoSetupScopeMask()) == 0;
   StubCode* stub_code = compiler->isolate()->stub_code();
 
@@ skipping 25 matching lines @@
     return false;
   }
   const int64_t index = Smi::Cast(constant->value()).AsInt64Value();
   const intptr_t scale = Instance::ElementSizeFor(cid);
   const intptr_t offset = Instance::DataOffsetFor(cid);
   const int64_t displacement = index * scale + offset;
   return Utils::IsInt(32, displacement);
 }
 
 
-LocationSummary* StringFromCharCodeInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* StringFromCharCodeInstr::MakeLocationSummary(Zone* zone,
                                                               bool opt) const {
   const intptr_t kNumInputs = 1;
   // TODO(fschneider): Allow immediate operands for the char code.
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void StringFromCharCodeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register char_code = locs()->in(0).reg();
   Register result = locs()->out(0).reg();
   __ movl(result,
           Immediate(reinterpret_cast<uword>(Symbols::PredefinedAddress())));
   __ movl(result, Address(result,
                           char_code,
                           TIMES_HALF_WORD_SIZE,  // Char code is a smi.
                           Symbols::kNullCharCodeSymbolOffset * kWordSize));
 }
 
 
-LocationSummary* StringToCharCodeInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* StringToCharCodeInstr::MakeLocationSummary(Zone* zone,
                                                             bool opt) const {
   const intptr_t kNumInputs = 1;
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void StringToCharCodeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(cid_ == kOneByteStringCid);
   Register str = locs()->in(0).reg();
   Register result = locs()->out(0).reg();
   Label is_one, done;
   __ movl(result, FieldAddress(str, String::length_offset()));
   __ cmpl(result, Immediate(Smi::RawValue(1)));
   __ j(EQUAL, &is_one, Assembler::kNearJump);
   __ movl(result, Immediate(Smi::RawValue(-1)));
   __ jmp(&done);
   __ Bind(&is_one);
   __ movzxb(result, FieldAddress(str, OneByteString::data_offset()));
   __ SmiTag(result);
   __ Bind(&done);
 }
 
 
-LocationSummary* StringInterpolateInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* StringInterpolateInstr::MakeLocationSummary(Zone* zone,
                                                              bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   summary->set_in(0, Location::RegisterLocation(EAX));
   summary->set_out(0, Location::RegisterLocation(EAX));
   return summary;
 }
 
 
 void StringInterpolateInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register array = locs()->in(0).reg();
   __ pushl(array);
   const int kNumberOfArguments = 1;
   const Array& kNoArgumentNames = Object::null_array();
   compiler->GenerateStaticCall(deopt_id(),
                                token_pos(),
                                CallFunction(),
                                kNumberOfArguments,
                                kNoArgumentNames,
                                locs(),
                                ICData::Handle());
   ASSERT(locs()->out(0).reg() == EAX);
 }
 
 
-LocationSummary* LoadUntaggedInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* LoadUntaggedInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 1;
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                kNumInputs,
                                Location::SameAsFirstInput(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadUntaggedInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register obj = locs()->in(0).reg();
   Register result = locs()->out(0).reg();
   if (object()->definition()->representation() == kUntagged) {
     __ movl(result, Address(obj, offset()));
   } else {
     ASSERT(object()->definition()->representation() == kTagged);
     __ movl(result, FieldAddress(obj, offset()));
   }
 }
 
 
-LocationSummary* LoadClassIdInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* LoadClassIdInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 1;
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadClassIdInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register object = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
   Label done;
@@ skipping 77 matching lines @@
       return kUnboxedInt32x4;
     case kTypedDataFloat64x2ArrayCid:
       return kUnboxedFloat64x2;
     default:
       UNIMPLEMENTED();
       return kTagged;
   }
 }
 
 
-LocationSummary* LoadIndexedInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* LoadIndexedInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::RequiresRegister());
   if (CanBeImmediateIndex(index(), class_id())) {
     // CanBeImmediateIndex must return false for unsafe smis.
     locs->set_in(1, Location::Constant(index()->definition()->AsConstant()));
   } else {
     // The index is either untagged (element size == 1) or a smi (for all
     // element sizes > 1).
     locs->set_in(1, (index_scale() == 1)
                         ? Location::WritableRegister()
                         : Location::RequiresRegister());
@@ skipping 144 matching lines @@
       return kUnboxedInt32x4;
     case kTypedDataFloat64x2ArrayCid:
       return kUnboxedFloat64x2;
     default:
       UNIMPLEMENTED();
       return kTagged;
   }
 }
 
 
-LocationSummary* StoreIndexedInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* StoreIndexedInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::RequiresRegister());
   if (CanBeImmediateIndex(index(), class_id())) {
     // CanBeImmediateIndex must return false for unsafe smis.
     locs->set_in(1, Location::Constant(index()->definition()->AsConstant()));
   } else {
     // The index is either untagged (element size == 1) or a smi (for all
     // element sizes > 1).
     locs->set_in(1, (index_scale() == 1)
                         ? Location::WritableRegister()
                         : Location::RequiresRegister());
@@ skipping 134 matching lines @@
     case kTypedDataFloat32x4ArrayCid:
     case kTypedDataFloat64x2ArrayCid:
       __ movups(element_address, locs()->in(2).fpu_reg());
       break;
     default:
       UNREACHABLE();
   }
 }
 
 
-LocationSummary* GuardFieldClassInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* GuardFieldClassInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 1;
 
   const intptr_t value_cid = value()->Type()->ToCid();
   const intptr_t field_cid = field().guarded_cid();
 
   const bool emit_full_guard = !opt || (field_cid == kIllegalCid);
   const bool needs_value_cid_temp_reg =
     (value_cid == kDynamicCid) && (emit_full_guard || (field_cid != kSmiCid));
   const bool needs_field_temp_reg = emit_full_guard;
 
   intptr_t num_temps = 0;
   if (needs_value_cid_temp_reg) {
     num_temps++;
   }
   if (needs_field_temp_reg) {
     num_temps++;
   }
 
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, num_temps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, num_temps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
 
   for (intptr_t i = 0; i < num_temps; i++) {
     summary->set_temp(i, Location::RequiresRegister());
   }
 
   return summary;
 }
 
 
@@ skipping 126 matching lines @@
     } else {
       // Both value's and field's class id is known.
       ASSERT((value_cid != field_cid) && (value_cid != nullability));
       __ jmp(fail);
     }
   }
   __ Bind(&ok);
 }
 
 
-LocationSummary* GuardFieldLengthInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* GuardFieldLengthInstr::MakeLocationSummary(Zone* zone,
                                                             bool opt) const {
   const intptr_t kNumInputs = 1;
   if (!opt || (field().guarded_list_length() == Field::kUnknownFixedLength)) {
     const intptr_t kNumTemps = 3;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresRegister());
     // We need temporaries for field object, length offset and expected length.
     summary->set_temp(0, Location::RequiresRegister());
     summary->set_temp(1, Location::RequiresRegister());
     summary->set_temp(2, Location::RequiresRegister());
     return summary;
   } else {
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, 0, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, 0, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresRegister());
     return summary;
   }
   UNREACHABLE();
 }
 
 
 void GuardFieldLengthInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (field().guarded_list_length() == Field::kNoFixedLength) {
     ASSERT(!compiler->is_optimizing());
@@ skipping 117 matching lines @@
     }
   }
 
  private:
   Instruction* instruction_;
   const Class& cls_;
   const Register result_;
 };
 
 
-LocationSummary* StoreInstanceFieldInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* StoreInstanceFieldInstr::MakeLocationSummary(Zone* zone,
                                                               bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps =
       (IsUnboxedStore() && opt) ? 2 :
           ((IsPotentialUnboxedStore()) ? 3 : 0);
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps,
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps,
           ((IsUnboxedStore() && opt && is_potential_unboxed_initialization_) ||
            IsPotentialUnboxedStore())
           ? LocationSummary::kCallOnSlowPath
           : LocationSummary::kNoCall);
 
   summary->set_in(0, Location::RequiresRegister());
   if (IsUnboxedStore() && opt) {
     summary->set_in(1, Location::RequiresFpuRegister());
     summary->set_temp(0, Location::RequiresRegister());
     summary->set_temp(1, Location::RequiresRegister());
@@ skipping 207 matching lines @@
                                   value_reg,
                                   is_object_reference_initialization_ ?
                                       Assembler::kEmptyOrSmiOrNull :
                                       Assembler::kHeapObjectOrSmi);
     }
   }
   __ Bind(&skip_store);
 }
 
 
-LocationSummary* LoadStaticFieldInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* LoadStaticFieldInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   // By specifying same register as input, our simple register allocator can
   // generate better code.
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 // When the parser is building an implicit static getter for optimization,
 // it can generate a function body where deoptimization ids do not line up
 // with the unoptimized code.
 //
 // This is safe only so long as LoadStaticFieldInstr cannot deoptimize.
 void LoadStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register field = locs()->in(0).reg();
   Register result = locs()->out(0).reg();
   __ movl(result, FieldAddress(field, Field::value_offset()));
 }
 
 
-LocationSummary* StoreStaticFieldInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* StoreStaticFieldInstr::MakeLocationSummary(Zone* zone,
                                                             bool opt) const {
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, 1, 1, LocationSummary::kNoCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, 1, 1, LocationSummary::kNoCall);
   locs->set_in(0, value()->NeedsStoreBuffer() ? Location::WritableRegister()
                                               : Location::RequiresRegister());
   locs->set_temp(0, Location::RequiresRegister());
   return locs;
 }
 
 
 void StoreStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   Register temp = locs()->temp(0).reg();
 
   __ LoadObject(temp, field());
   if (this->value()->NeedsStoreBuffer()) {
     __ StoreIntoObject(temp,
         FieldAddress(temp, Field::value_offset()), value, CanValueBeSmi());
   } else {
     __ StoreIntoObjectNoBarrier(
         temp, FieldAddress(temp, Field::value_offset()), value);
   }
 }
 
 
-LocationSummary* InstanceOfInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* InstanceOfInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   summary->set_in(0, Location::RegisterLocation(EAX));
   summary->set_in(1, Location::RegisterLocation(ECX));
   summary->set_in(2, Location::RegisterLocation(EDX));
   summary->set_out(0, Location::RegisterLocation(EAX));
   return summary;
 }
 
 
 void InstanceOfInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->in(0).reg() == EAX);  // Value.
   ASSERT(locs()->in(1).reg() == ECX);  // Instantiator.
   ASSERT(locs()->in(2).reg() == EDX);  // Instantiator type arguments.
 
   compiler->GenerateInstanceOf(token_pos(),
                                deopt_id(),
                                type(),
                                negate_result(),
                                locs());
   ASSERT(locs()->out(0).reg() == EAX);
 }
 
 
 // TODO(srdjan): In case of constant inputs make CreateArray kNoCall and
 // use slow path stub.
-LocationSummary* CreateArrayInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* CreateArrayInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(ECX));
   locs->set_in(1, Location::RegisterLocation(EDX));
   locs->set_out(0, Location::RegisterLocation(EAX));
   return locs;
 }
 
 
 // Inlines array allocation for known constant values.
 static void InlineArrayAllocation(FlowGraphCompiler* compiler,
                                   intptr_t num_elements,
@@ skipping 89 matching lines @@
   compiler->GenerateCall(token_pos(),
                          &label,
                          RawPcDescriptors::kOther,
                          locs());
   compiler->AddStubCallTarget(stub);
   __ Bind(&done);
   ASSERT(locs()->out(0).reg() == kResultReg);
 }
 
 
-LocationSummary* LoadFieldInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* LoadFieldInstr::MakeLocationSummary(Zone* zone,
                                                      bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps =
       (IsUnboxedLoad() && opt) ? 1 :
           ((IsPotentialUnboxedLoad()) ? 2 : 0);
 
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps,
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps,
           (opt && !IsPotentialUnboxedLoad())
           ? LocationSummary::kNoCall
           : LocationSummary::kCallOnSlowPath);
 
   locs->set_in(0, Location::RequiresRegister());
 
   if (IsUnboxedLoad() && opt) {
     locs->set_temp(0, Location::RequiresRegister());
   } else if (IsPotentialUnboxedLoad()) {
     locs->set_temp(0, opt ? Location::RequiresFpuRegister()
@@ skipping 97 matching lines @@
       __ jmp(&done);
     }
 
     __ Bind(&load_pointer);
   }
   __ movl(result, FieldAddress(instance_reg, offset_in_bytes()));
   __ Bind(&done);
 }
 
 
-LocationSummary* InstantiateTypeInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* InstantiateTypeInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(EAX));
   locs->set_out(0, Location::RegisterLocation(EAX));
   return locs;
 }
 
 
 void InstantiateTypeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register instantiator_reg = locs()->in(0).reg();
   Register result_reg = locs()->out(0).reg();
 
   // 'instantiator_reg' is the instantiator TypeArguments object (or null).
   // A runtime call to instantiate the type is required.
   __ PushObject(Object::null_object());  // Make room for the result.
   __ PushObject(type());
   __ pushl(instantiator_reg);  // Push instantiator type arguments.
   compiler->GenerateRuntimeCall(token_pos(),
                                 deopt_id(),
                                 kInstantiateTypeRuntimeEntry,
                                 2,
                                 locs());
   __ Drop(2);  // Drop instantiator and uninstantiated type.
   __ popl(result_reg);  // Pop instantiated type.
   ASSERT(instantiator_reg == result_reg);
 }
 
 
 LocationSummary* InstantiateTypeArgumentsInstr::MakeLocationSummary(
-    Isolate* isolate, bool opt) const {
+    Zone* zone, bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(EAX));
   locs->set_out(0, Location::RegisterLocation(EAX));
   return locs;
 }
 
 
 void InstantiateTypeArgumentsInstr::EmitNativeCode(
     FlowGraphCompiler* compiler) {
   Register instantiator_reg = locs()->in(0).reg();
   Register result_reg = locs()->out(0).reg();
@@ skipping 47 matching lines @@
                                 kInstantiateTypeArgumentsRuntimeEntry,
                                 2,
                                 locs());
   __ Drop(2);  // Drop instantiator and uninstantiated type arguments.
   __ popl(result_reg);  // Pop instantiated type arguments.
   __ Bind(&type_arguments_instantiated);
 }
 
 
 LocationSummary* AllocateUninitializedContextInstr::MakeLocationSummary(
-    Isolate* isolate,
+    Zone* zone,
     bool opt) const {
   ASSERT(opt);
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 1;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCallOnSlowPath);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCallOnSlowPath);
   locs->set_temp(0, Location::RegisterLocation(ECX));
   locs->set_out(0, Location::RegisterLocation(EAX));
   return locs;
 }
 
 
 class AllocateContextSlowPath : public SlowPathCode {
  public:
   explicit AllocateContextSlowPath(
       AllocateUninitializedContextInstr* instruction)
@@ skipping 41 matching lines @@
                       temp);  // end address
 
   // Setup up number of context variables field.
   __ movl(FieldAddress(result, Context::num_variables_offset()),
           Immediate(num_context_variables()));
 
   __ Bind(slow_path->exit_label());
 }
 
 
-LocationSummary* AllocateContextInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* AllocateContextInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 1;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_temp(0, Location::RegisterLocation(EDX));
   locs->set_out(0, Location::RegisterLocation(EAX));
   return locs;
 }
 
 
 void AllocateContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->temp(0).reg() == EDX);
   ASSERT(locs()->out(0).reg() == EAX);
 
   __ movl(EDX, Immediate(num_context_variables()));
   StubCode* stub_code = compiler->isolate()->stub_code();
   const ExternalLabel label(stub_code->AllocateContextEntryPoint());
   compiler->GenerateCall(token_pos(),
                          &label,
                          RawPcDescriptors::kOther,
                          locs());
 }
 
 
-LocationSummary* InitStaticFieldInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* InitStaticFieldInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 1;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(EAX));
   locs->set_temp(0, Location::RegisterLocation(ECX));
   return locs;
 }
 
 
 void InitStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register field = locs()->in(0).reg();
   Register temp = locs()->temp(0).reg();
 
@@ skipping 12 matching lines @@
   compiler->GenerateRuntimeCall(token_pos(),
                                 deopt_id(),
                                 kInitStaticFieldRuntimeEntry,
                                 1,
                                 locs());
   __ Drop(2);  // Remove argument and unused result.
   __ Bind(&no_call);
 }
 
 
-LocationSummary* CloneContextInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* CloneContextInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(EAX));
   locs->set_out(0, Location::RegisterLocation(EAX));
   return locs;
 }
 
 
 void CloneContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register context_value = locs()->in(0).reg();
   Register result = locs()->out(0).reg();
 
   __ PushObject(Object::null_object());  // Make room for the result.
   __ pushl(context_value);
   compiler->GenerateRuntimeCall(token_pos(),
                                 deopt_id(),
                                 kCloneContextRuntimeEntry,
                                 1,
                                 locs());
   __ popl(result);  // Remove argument.
   __ popl(result);  // Get result (cloned context).
 }
 
 
-LocationSummary* CatchBlockEntryInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* CatchBlockEntryInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   UNREACHABLE();
   return NULL;
 }
 
 
 void CatchBlockEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   __ Bind(compiler->GetJumpLabel(this));
   compiler->AddExceptionHandler(catch_try_index(),
                                 try_index(),
@@ skipping 13 matching lines @@
 
   // Restore stack and initialize the two exception variables:
   // exception and stack trace variables.
   __ movl(Address(EBP, exception_var().index() * kWordSize),
           kExceptionObjectReg);
   __ movl(Address(EBP, stacktrace_var().index() * kWordSize),
           kStackTraceObjectReg);
 }
 
 
-LocationSummary* CheckStackOverflowInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* CheckStackOverflowInstr::MakeLocationSummary(Zone* zone,
                                                               bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs,
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs,
                           kNumTemps,
                           LocationSummary::kCallOnSlowPath);
   return summary;
 }
 
 
 class CheckStackOverflowSlowPath : public SlowPathCode {
  public:
   explicit CheckStackOverflowSlowPath(CheckStackOverflowInstr* instruction)
       : instruction_(instruction) { }
@@ skipping 169 matching lines @@
     __ shll(left, right);
     __ sarl(left, right);
     __ cmpl(left, temp);
     __ j(NOT_EQUAL, deopt);  // Overflow.
     // Shift for result now we know there is no overflow.
     __ shll(left, right);
   }
 }
 
 
-LocationSummary* BinarySmiOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BinarySmiOpInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 2;
   if (op_kind() == Token::kTRUNCDIV) {
     const intptr_t kNumTemps = 1;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     if (RightIsPowerOfTwoConstant()) {
       summary->set_in(0, Location::RequiresRegister());
       ConstantInstr* right_constant = right()->definition()->AsConstant();
       // The programmer only controls one bit, so the constant is safe.
       summary->set_in(1, Location::Constant(right_constant));
       summary->set_temp(0, Location::RequiresRegister());
       summary->set_out(0, Location::SameAsFirstInput());
     } else {
       // Both inputs must be writable because they will be untagged.
       summary->set_in(0, Location::RegisterLocation(EAX));
       summary->set_in(1, Location::WritableRegister());
       summary->set_out(0, Location::SameAsFirstInput());
       // Will be used for sign extension and division.
       summary->set_temp(0, Location::RegisterLocation(EDX));
     }
     return summary;
   } else if (op_kind() == Token::kMOD) {
     const intptr_t kNumTemps = 1;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     // Both inputs must be writable because they will be untagged.
     summary->set_in(0, Location::RegisterLocation(EDX));
     summary->set_in(1, Location::WritableRegister());
     summary->set_out(0, Location::SameAsFirstInput());
     // Will be used for sign extension and division.
     summary->set_temp(0, Location::RegisterLocation(EAX));
     return summary;
   } else if (op_kind() == Token::kSHR) {
     const intptr_t kNumTemps = 0;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresRegister());
     summary->set_in(1, Location::FixedRegisterOrSmiConstant(right(), ECX));
     summary->set_out(0, Location::SameAsFirstInput());
     return summary;
   } else if (op_kind() == Token::kSHL) {
     const intptr_t kNumTemps = can_overflow() ? 1 : 0;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresRegister());
     summary->set_in(1, Location::FixedRegisterOrSmiConstant(right(), ECX));
     if (can_overflow()) {
       summary->set_temp(0, Location::RequiresRegister());
     }
     summary->set_out(0, Location::SameAsFirstInput());
     return summary;
   } else {
     const intptr_t kNumTemps = 0;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresRegister());
     ConstantInstr* constant = right()->definition()->AsConstant();
     if (constant != NULL) {
       summary->set_in(1, Location::RegisterOrSmiConstant(right()));
     } else {
       summary->set_in(1, Location::PrefersRegister());
     }
     summary->set_out(0, Location::SameAsFirstInput());
     return summary;
   }
@@ skipping 232 matching lines @@
       UNREACHABLE();
       break;
     }
     default:
       UNREACHABLE();
       break;
   }
 }
 
 
-LocationSummary* BinaryInt32OpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BinaryInt32OpInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 2;
   if (op_kind() == Token::kTRUNCDIV) {
     UNREACHABLE();
     return NULL;
   } else if (op_kind() == Token::kMOD) {
      UNREACHABLE();
     return NULL;
   } else if (op_kind() == Token::kSHR) {
     const intptr_t kNumTemps = 0;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresRegister());
     summary->set_in(1, Location::FixedRegisterOrSmiConstant(right(), ECX));
     summary->set_out(0, Location::SameAsFirstInput());
     return summary;
   } else if (op_kind() == Token::kSHL) {
     const intptr_t kNumTemps = can_overflow() ? 1 : 0;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresRegister());
     summary->set_in(1, Location::FixedRegisterOrSmiConstant(right(), ECX));
     if (can_overflow()) {
       summary->set_temp(0, Location::RequiresRegister());
     }
     summary->set_out(0, Location::SameAsFirstInput());
     return summary;
   } else {
     const intptr_t kNumTemps = 0;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresRegister());
     ConstantInstr* constant = right()->definition()->AsConstant();
     if (constant != NULL) {
       summary->set_in(1, Location::RegisterOrSmiConstant(right()));
     } else {
       summary->set_in(1, Location::PrefersRegister());
     }
     summary->set_out(0, Location::SameAsFirstInput());
     return summary;
   }
@@ skipping 110 matching lines @@
                             deopt);
       break;
 
     default:
       UNREACHABLE();
       break;
   }
 }
 
 
-LocationSummary* BinaryUint32OpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BinaryUint32OpInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = (op_kind() == Token::kMUL) ? 1 : 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   if (op_kind() == Token::kMUL) {
     summary->set_in(0, Location::RegisterLocation(EAX));
     summary->set_temp(0, Location::RegisterLocation(EDX));
   } else {
     summary->set_in(0, Location::RequiresRegister());
   }
   summary->set_in(1, Location::RequiresRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
@@ skipping 17 matching lines @@
       __ mull(right);  // Result in EDX:EAX.
       ASSERT(out == EAX);
       ASSERT(locs()->temp(0).reg() == EDX);
       break;
     default:
       UNREACHABLE();
   }
 }
 
 
-LocationSummary* CheckEitherNonSmiInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* CheckEitherNonSmiInstr::MakeLocationSummary(Zone* zone,
                                                              bool opt) const {
   intptr_t left_cid = left()->Type()->ToCid();
   intptr_t right_cid = right()->Type()->ToCid();
   ASSERT((left_cid != kDoubleCid) && (right_cid != kDoubleCid));
   const intptr_t kNumInputs = 2;
   const bool need_temp = (left()->definition() != right()->definition())
                       && (left_cid != kSmiCid)
                       && (right_cid != kSmiCid);
   const intptr_t kNumTemps = need_temp ? 1 : 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_in(1, Location::RequiresRegister());
   if (need_temp) summary->set_temp(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void CheckEitherNonSmiInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Label* deopt = compiler->AddDeoptStub(deopt_id(),
                                         ICData::kDeoptBinaryDoubleOp,
@@ skipping 11 matching lines @@
   } else {
     Register temp = locs()->temp(0).reg();
     __ movl(temp, left);
     __ orl(temp, right);
     __ testl(temp, Immediate(kSmiTagMask));
   }
   __ j(ZERO, deopt);
 }
 
 
-LocationSummary* BoxInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BoxInstr::MakeLocationSummary(Zone* zone,
                                                      bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCallOnSlowPath);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCallOnSlowPath);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void BoxInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register out_reg = locs()->out(0).reg();
   XmmRegister value = locs()->in(0).fpu_reg();
 
@@ skipping 13 matching lines @@
     case kUnboxedInt32x4:
       __ movups(FieldAddress(out_reg, ValueOffset()), value);
       break;
     default:
       UNREACHABLE();
       break;
   }
 }
 
 
-LocationSummary* UnboxInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnboxInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const bool needs_temp = CanDeoptimize() ||
       (CanConvertSmi() && (value()->Type()->ToCid() == kSmiCid));
 
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = needs_temp ? 1 : 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   if (needs_temp) {
     summary->set_temp(0, Location::RequiresRegister());
   }
   if (representation() == kUnboxedMint) {
     summary->set_out(0, Location::Pair(Location::RegisterLocation(EAX),
                                        Location::RegisterLocation(EDX)));
   } else {
     summary->set_out(0, Location::RequiresFpuRegister());
   }
@@ skipping 98 matching lines @@
       Label done;
       __ jmp(&done);
       __ Bind(&is_smi);
       EmitSmiConversion(compiler);
       __ Bind(&done);
     }
   }
 }
 
 
-LocationSummary* BoxInteger32Instr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BoxInteger32Instr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps,
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps,
       ValueFitsSmi() ? LocationSummary::kNoCall
                      : LocationSummary::kCallOnSlowPath);
   const bool needs_writable_input = ValueFitsSmi() ||
       (from_representation() == kUnboxedUint32);
   summary->set_in(0, needs_writable_input ? Location::RequiresRegister()
                                           : Location::WritableRegister());
   summary->set_out(0, ValueFitsSmi() ? Location::SameAsFirstInput()
                                      : Location::RequiresRegister());
   return summary;
 }
@@ skipping 27 matching lines @@
       __ movl(FieldAddress(out, Mint::value_offset() + kWordSize), value);
     } else {
       __ movl(FieldAddress(out, Mint::value_offset() + kWordSize),
               Immediate(0));
     }
     __ Bind(&done);
   }
 }
 
 
-LocationSummary* BoxInt64Instr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BoxInt64Instr::MakeLocationSummary(Zone* zone,
                                                     bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = ValueFitsSmi() ? 0 : 1;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs,
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs,
                           kNumTemps,
                           ValueFitsSmi()
                               ? LocationSummary::kNoCall
                               : LocationSummary::kCallOnSlowPath);
   summary->set_in(0, Location::Pair(Location::RequiresRegister(),
                                     Location::RequiresRegister()));
   if (!ValueFitsSmi()) {
     summary->set_temp(0, Location::RequiresRegister());
   }
   summary->set_out(0, Location::RequiresRegister());
@@ skipping 42 matching lines @@
   __ subl(value_lo, Immediate(0x40000000));
 
   BoxAllocationSlowPath::Allocate(
       compiler, this, compiler->mint_class(), out_reg, kNoRegister);
   __ movl(FieldAddress(out_reg, Mint::value_offset()), value_lo);
   __ movl(FieldAddress(out_reg, Mint::value_offset() + kWordSize), value_hi);
   __ Bind(&done);
 }
 
 
-LocationSummary* UnboxInteger32Instr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnboxInteger32Instr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   const intptr_t value_cid = value()->Type()->ToCid();
   const intptr_t kNumInputs = 1;
   intptr_t kNumTemps = 0;
 
   if (CanDeoptimize()) {
     if ((value_cid != kSmiCid) &&
         (value_cid != kMintCid) &&
         !is_truncating()) {
       kNumTemps = 2;
     } else {
       kNumTemps = 1;
     }
   }
 
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   for (int i = 0; i < kNumTemps; i++) {
     summary->set_temp(i, Location::RequiresRegister());
   }
   summary->set_out(0, ((value_cid == kSmiCid) || (value_cid != kMintCid)) ?
       Location::SameAsFirstInput() : Location::RequiresRegister());
   return summary;
 }
 
 
@@ skipping 58 matching lines @@
                       result,
                       Address(value, TIMES_2, lo_offset),
                       Address(value, TIMES_2, hi_offset),
                       temp,
                       out_of_range);
     __ Bind(&done);
   }
 }
 
 
-LocationSummary* LoadCodeUnitsInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* LoadCodeUnitsInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const bool might_box = (representation() == kTagged) && !can_pack_into_smi();
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = might_box ? 1 : 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps,
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps,
       might_box ? LocationSummary::kCallOnSlowPath : LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   // The smi index is either untagged (element size == 1), or it is left smi
   // tagged (for all element sizes > 1).
   summary->set_in(1, (index_scale() == 1) ? Location::WritableRegister()
                                           : Location::RequiresRegister());
   if (might_box) {
     summary->set_temp(0, Location::RequiresRegister());
   }
 
@@ skipping 88 matching lines @@
           compiler, this, compiler->mint_class(), result, kNoRegister);
       __ movl(FieldAddress(result, Mint::value_offset()), temp);
       __ movl(FieldAddress(result, Mint::value_offset() + kWordSize),
               Immediate(0));
       __ Bind(&done);
     }
   }
 }
 
 
-LocationSummary* BinaryDoubleOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BinaryDoubleOpInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void BinaryDoubleOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
   XmmRegister right = locs()->in(1).fpu_reg();
 
   ASSERT(locs()->out(0).fpu_reg() == left);
 
   switch (op_kind()) {
     case Token::kADD: __ addsd(left, right); break;
     case Token::kSUB: __ subsd(left, right); break;
     case Token::kMUL: __ mulsd(left, right); break;
     case Token::kDIV: __ divsd(left, right); break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* BinaryFloat32x4OpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BinaryFloat32x4OpInstr::MakeLocationSummary(Zone* zone,
                                                              bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void BinaryFloat32x4OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
   XmmRegister right = locs()->in(1).fpu_reg();
 
   ASSERT(locs()->out(0).fpu_reg() == left);
 
   switch (op_kind()) {
     case Token::kADD: __ addps(left, right); break;
     case Token::kSUB: __ subps(left, right); break;
     case Token::kMUL: __ mulps(left, right); break;
     case Token::kDIV: __ divps(left, right); break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* BinaryFloat64x2OpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BinaryFloat64x2OpInstr::MakeLocationSummary(Zone* zone,
                                                              bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void BinaryFloat64x2OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
   XmmRegister right = locs()->in(1).fpu_reg();
 
   ASSERT(locs()->out(0).fpu_reg() == left);
 
   switch (op_kind()) {
     case Token::kADD: __ addpd(left, right); break;
     case Token::kSUB: __ subpd(left, right); break;
     case Token::kMUL: __ mulpd(left, right); break;
     case Token::kDIV: __ divpd(left, right); break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* Simd32x4ShuffleInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Simd32x4ShuffleInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Simd32x4ShuffleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->in(0).fpu_reg();
 
   ASSERT(locs()->out(0).fpu_reg() == value);
@@ skipping 17 matching lines @@
       break;
     case MethodRecognizer::kFloat32x4Shuffle:
     case MethodRecognizer::kInt32x4Shuffle:
       __ shufps(value, value, Immediate(mask_));
       break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* Simd32x4ShuffleMixInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Simd32x4ShuffleMixInstr::MakeLocationSummary(Zone* zone,
                                                               bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Simd32x4ShuffleMixInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
   XmmRegister right = locs()->in(1).fpu_reg();
 
   ASSERT(locs()->out(0).fpu_reg() == left);
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4ShuffleMix:
     case MethodRecognizer::kInt32x4ShuffleMix:
       __ shufps(left, right, Immediate(mask_));
       break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* Simd32x4GetSignMaskInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Simd32x4GetSignMaskInstr::MakeLocationSummary(Zone* zone,
                                                                bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void Simd32x4GetSignMaskInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->in(0).fpu_reg();
   Register out = locs()->out(0).reg();
 
   __ movmskps(out, value);
   __ SmiTag(out);
 }
 
 
 LocationSummary* Float32x4ConstructorInstr::MakeLocationSummary(
-    Isolate* isolate, bool opt) const {
+    Zone* zone, bool opt) const {
   const intptr_t kNumInputs = 4;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_in(2, Location::RequiresFpuRegister());
   summary->set_in(3, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4ConstructorInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
@@ skipping 12 matching lines @@
   __ cvtsd2ss(v0, v0);
   __ movss(Address(ESP, 8), v0);
   __ movsd(v0, v3);
   __ cvtsd2ss(v0, v0);
   __ movss(Address(ESP, 12), v0);
   __ movups(v0, Address(ESP, 0));
   __ addl(ESP, Immediate(16));
 }
 
 
-LocationSummary* Float32x4ZeroInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float32x4ZeroInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ZeroInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->out(0).fpu_reg();
   __ xorps(value, value);
 }
 
 
-LocationSummary* Float32x4SplatInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float32x4SplatInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4SplatInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->out(0).fpu_reg();
   ASSERT(locs()->in(0).fpu_reg() == locs()->out(0).fpu_reg());
   // Convert to Float32.
   __ cvtsd2ss(value, value);
   // Splat across all lanes.
   __ shufps(value, value, Immediate(0x00));
 }
 
 
-LocationSummary* Float32x4ComparisonInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float32x4ComparisonInstr::MakeLocationSummary(Zone* zone,
                                                                bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4ComparisonInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
   XmmRegister right = locs()->in(1).fpu_reg();
@@ skipping 18 matching lines @@
       break;
     case MethodRecognizer::kFloat32x4LessThanOrEqual:
       __ cmppsle(left, right);
       break;
 
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* Float32x4MinMaxInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float32x4MinMaxInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4MinMaxInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
   XmmRegister right = locs()->in(1).fpu_reg();
 
   ASSERT(locs()->out(0).fpu_reg() == left);
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Min:
       __ minps(left, right);
       break;
     case MethodRecognizer::kFloat32x4Max:
       __ maxps(left, right);
       break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* Float32x4ScaleInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float32x4ScaleInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4ScaleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
   XmmRegister right = locs()->in(1).fpu_reg();
 
   ASSERT(locs()->out(0).fpu_reg() == left);
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Scale:
       __ cvtsd2ss(left, left);
       __ shufps(left, left, Immediate(0x00));
       __ mulps(left, right);
       break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* Float32x4SqrtInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float32x4SqrtInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4SqrtInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
 
   ASSERT(locs()->out(0).fpu_reg() == left);
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Sqrt:
       __ sqrtps(left);
       break;
     case MethodRecognizer::kFloat32x4Reciprocal:
       __ reciprocalps(left);
       break;
     case MethodRecognizer::kFloat32x4ReciprocalSqrt:
       __ rsqrtps(left);
       break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* Float32x4ZeroArgInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float32x4ZeroArgInstr::MakeLocationSummary(Zone* zone,
                                                             bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4ZeroArgInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
 
   ASSERT(locs()->out(0).fpu_reg() == left);
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Negate:
       __ negateps(left);
       break;
     case MethodRecognizer::kFloat32x4Absolute:
       __ absps(left);
       break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* Float32x4ClampInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float32x4ClampInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_in(2, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4ClampInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
   XmmRegister lower = locs()->in(1).fpu_reg();
   XmmRegister upper = locs()->in(2).fpu_reg();
   ASSERT(locs()->out(0).fpu_reg() == left);
   __ minps(left, upper);
   __ maxps(left, lower);
 }
 
 
-LocationSummary* Float32x4WithInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float32x4WithInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4WithInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister replacement = locs()->in(0).fpu_reg();
   XmmRegister value = locs()->in(1).fpu_reg();
@@ skipping 43 matching lines @@
       __ movss(Address(ESP, 12), replacement);
       // Move updated value into output register.
       __ movups(replacement, Address(ESP, 0));
       __ addl(ESP, Immediate(16));
       break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* Float32x4ToInt32x4Instr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float32x4ToInt32x4Instr::MakeLocationSummary(Zone* zone,
                                                               bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4ToInt32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // NOP.
 }
 
 
-LocationSummary* Simd64x2ShuffleInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Simd64x2ShuffleInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Simd64x2ShuffleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->in(0).fpu_reg();
 
   ASSERT(locs()->out(0).fpu_reg() == value);
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat64x2GetX:
       // nop.
       break;
     case MethodRecognizer::kFloat64x2GetY:
       __ shufpd(value, value, Immediate(0x33));
       break;
     default: UNREACHABLE();
   }
 }
 
 
 
-LocationSummary* Float64x2ZeroInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float64x2ZeroInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float64x2ZeroInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->out(0).fpu_reg();
   __ xorpd(value, value);
 }
 
 
-LocationSummary* Float64x2SplatInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float64x2SplatInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float64x2SplatInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->out(0).fpu_reg();
   __ shufpd(value, value, Immediate(0x0));
 }
 
 
 LocationSummary* Float64x2ConstructorInstr::MakeLocationSummary(
-    Isolate* isolate, bool opt) const {
+    Zone* zone, bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float64x2ConstructorInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister v0 = locs()->in(0).fpu_reg();
   XmmRegister v1 = locs()->in(1).fpu_reg();
   ASSERT(v0 == locs()->out(0).fpu_reg());
   // shufpd mask 0x0 results in:
   // Lower 64-bits of v0 = Lower 64-bits of v0.
   // Upper 64-bits of v0 = Lower 64-bits of v1.
   __ shufpd(v0, v1, Immediate(0x0));
 }
 
 
 LocationSummary* Float64x2ToFloat32x4Instr::MakeLocationSummary(
-    Isolate* isolate, bool opt) const {
+    Zone* zone, bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float64x2ToFloat32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->out(0).fpu_reg();
   __ cvtpd2ps(value, value);
 }
 
 
 LocationSummary* Float32x4ToFloat64x2Instr::MakeLocationSummary(
-    Isolate* isolate, bool opt) const {
+    Zone* zone, bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float32x4ToFloat64x2Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->out(0).fpu_reg();
   __ cvtps2pd(value, value);
 }
 
 
-LocationSummary* Float64x2ZeroArgInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float64x2ZeroArgInstr::MakeLocationSummary(Zone* zone,
                                                             bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   if (representation() == kTagged) {
     ASSERT(op_kind() == MethodRecognizer::kFloat64x2GetSignMask);
     summary->set_out(0, Location::RequiresRegister());
   } else {
     ASSERT(representation() == kUnboxedFloat64x2);
     summary->set_out(0, Location::SameAsFirstInput());
   }
   return summary;
 }
@@ skipping 17 matching lines @@
       break;
     case MethodRecognizer::kFloat64x2GetSignMask:
       __ movmskpd(locs()->out(0).reg(), left);
       __ SmiTag(locs()->out(0).reg());
       break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* Float64x2OneArgInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Float64x2OneArgInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float64x2OneArgInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
   XmmRegister right = locs()->in(1).fpu_reg();
@@ skipping 29 matching lines @@
       break;
     case MethodRecognizer::kFloat64x2Max:
       __ maxpd(left, right);
       break;
     default: UNREACHABLE();
   }
 }
 
 
 LocationSummary* Int32x4ConstructorInstr::MakeLocationSummary(
-    Isolate* isolate, bool opt) const {
+    Zone* zone, bool opt) const {
   const intptr_t kNumInputs = 4;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_in(1, Location::RequiresRegister());
   summary->set_in(2, Location::RequiresRegister());
   summary->set_in(3, Location::RequiresRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Int32x4ConstructorInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register v0 = locs()->in(0).reg();
   Register v1 = locs()->in(1).reg();
   Register v2 = locs()->in(2).reg();
   Register v3 = locs()->in(3).reg();
   XmmRegister result = locs()->out(0).fpu_reg();
   __ subl(ESP, Immediate(4 * kInt32Size));
   __ movl(Address(ESP, 0 * kInt32Size), v0);
   __ movl(Address(ESP, 1 * kInt32Size), v1);
   __ movl(Address(ESP, 2 * kInt32Size), v2);
   __ movl(Address(ESP, 3 * kInt32Size), v3);
   __ movups(result, Address(ESP, 0));
   __ addl(ESP, Immediate(4 * kInt32Size));
 }
 
 
 LocationSummary* Int32x4BoolConstructorInstr::MakeLocationSummary(
-    Isolate* isolate, bool opt) const {
+    Zone* zone, bool opt) const {
   const intptr_t kNumInputs = 4;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_in(1, Location::RequiresRegister());
   summary->set_in(2, Location::RequiresRegister());
   summary->set_in(3, Location::RequiresRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Int32x4BoolConstructorInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
@@ skipping 37 matching lines @@
   __ jmp(&w_done);
   __ Bind(&w_false);
   __ movl(Address(ESP, 12), Immediate(0x0));
   __ Bind(&w_done);
 
   __ movups(result, Address(ESP, 0));
   __ addl(ESP, Immediate(16));
 }
 
 
-LocationSummary* Int32x4GetFlagInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Int32x4GetFlagInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void Int32x4GetFlagInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->in(0).fpu_reg();
   Register result = locs()->out(0).reg();
   Label done;
@@ skipping 20 matching lines @@
   __ testl(result, result);
   __ j(NOT_ZERO, &non_zero, Assembler::kNearJump);
   __ LoadObject(result, Bool::False());
   __ jmp(&done);
   __ Bind(&non_zero);
   __ LoadObject(result, Bool::True());
   __ Bind(&done);
 }
 
 
-LocationSummary* Int32x4SelectInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Int32x4SelectInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 1;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_in(2, Location::RequiresFpuRegister());
   summary->set_temp(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Int32x4SelectInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister mask = locs()->in(0).fpu_reg();
   XmmRegister trueValue = locs()->in(1).fpu_reg();
   XmmRegister falseValue = locs()->in(2).fpu_reg();
   XmmRegister out = locs()->out(0).fpu_reg();
   XmmRegister temp = locs()->temp(0).fpu_reg();
   ASSERT(out == mask);
   // Copy mask.
   __ movaps(temp, mask);
   // Invert it.
   __ notps(temp);
   // mask = mask & trueValue.
   __ andps(mask, trueValue);
   // temp = temp & falseValue.
   __ andps(temp, falseValue);
   // out = mask | temp.
   __ orps(mask, temp);
 }
 
 
-LocationSummary* Int32x4SetFlagInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Int32x4SetFlagInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Int32x4SetFlagInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister mask = locs()->in(0).fpu_reg();
   Register flag = locs()->in(1).reg();
@@ skipping 31 matching lines @@
     break;
     default: UNREACHABLE();
   }
   __ Bind(&exitPath);
   // Copy mask back to register.
   __ movups(mask, Address(ESP, 0));
   __ addl(ESP, Immediate(16));
 }
 
 
-LocationSummary* Int32x4ToFloat32x4Instr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Int32x4ToFloat32x4Instr::MakeLocationSummary(Zone* zone,
                                                               bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Int32x4ToFloat32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // NOP.
 }
 
 
-LocationSummary* BinaryInt32x4OpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BinaryInt32x4OpInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void BinaryInt32x4OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister left = locs()->in(0).fpu_reg();
   XmmRegister right = locs()->in(1).fpu_reg();
@@ skipping 15 matching lines @@
       __ addpl(left, right);
       break;
     case Token::kSUB:
       __ subpl(left, right);
       break;
     default: UNREACHABLE();
   }
 }
 
 
-LocationSummary* MathUnaryInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* MathUnaryInstr::MakeLocationSummary(Zone* zone,
                                                      bool opt) const {
   if ((kind() == MathUnaryInstr::kSin) || (kind() == MathUnaryInstr::kCos)) {
     const intptr_t kNumInputs = 1;
     const intptr_t kNumTemps = 1;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kCall);
     summary->set_in(0, Location::FpuRegisterLocation(XMM1));
     // EDI is chosen because it is callee saved so we do not need to back it
     // up before calling into the runtime.
     summary->set_temp(0, Location::RegisterLocation(EDI));
     summary->set_out(0, Location::FpuRegisterLocation(XMM1));
     return summary;
   }
   ASSERT((kind() == MathUnaryInstr::kSqrt) ||
          (kind() == MathUnaryInstr::kDoubleSquare));
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   if (kind() == MathUnaryInstr::kDoubleSquare) {
     summary->set_out(0, Location::SameAsFirstInput());
   } else {
     summary->set_out(0, Location::RequiresFpuRegister());
   }
   return summary;
 }
 
 
@@ skipping 14 matching lines @@
     __ CallRuntime(TargetFunction(), InputCount());
     __ fstpl(Address(ESP, 0));
     __ movsd(locs()->out(0).fpu_reg(), Address(ESP, 0));
     // Restore ESP.
     __ movl(ESP, locs()->temp(0).reg());
   }
 }
 
 
 LocationSummary* CaseInsensitiveCompareUC16Instr::MakeLocationSummary(
-    Isolate* isolate, bool opt) const {
+    Zone* zone, bool opt) const {
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, InputCount(), kNumTemps, LocationSummary::kCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, InputCount(), kNumTemps, LocationSummary::kCall);
   summary->set_in(0, Location::RegisterLocation(EAX));
   summary->set_in(1, Location::RegisterLocation(ECX));
   summary->set_in(2, Location::RegisterLocation(EDX));
   summary->set_in(3, Location::RegisterLocation(EBX));
   summary->set_out(0, Location::RegisterLocation(EAX));
   return summary;
 }
 
 
 void CaseInsensitiveCompareUC16Instr::EmitNativeCode(
@@ skipping 11 matching lines @@
   __ movl(Address(ESP, + 3 * kWordSize), locs()->in(3).reg());
 
   // Call the function.
   __ CallRuntime(TargetFunction(), TargetFunction().argument_count());
 
   // Restore ESP.
   __ movl(ESP, kSavedSPReg);
 }
 
 
-LocationSummary* MathMinMaxInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* MathMinMaxInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
   if (result_cid() == kDoubleCid) {
     const intptr_t kNumInputs = 2;
     const intptr_t kNumTemps = 1;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresFpuRegister());
     summary->set_in(1, Location::RequiresFpuRegister());
     // Reuse the left register so that code can be made shorter.
     summary->set_out(0, Location::SameAsFirstInput());
     summary->set_temp(0, Location::RequiresRegister());
     return summary;
   }
 
   ASSERT(result_cid() == kSmiCid);
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_in(1, Location::RequiresRegister());
   // Reuse the left register so that code can be made shorter.
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void MathMinMaxInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT((op_kind() == MethodRecognizer::kMathMin) ||
@@ skipping 49 matching lines @@
   __ cmpl(left, right);
   ASSERT(result == left);
   if (is_min) {
     __ cmovgel(result, right);
   } else {
     __ cmovlessl(result, right);
   }
 }
 
 
-LocationSummary* UnarySmiOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnarySmiOpInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
   const intptr_t kNumInputs = 1;
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                kNumInputs,
                                Location::SameAsFirstInput(),
                                LocationSummary::kNoCall);
 }
 
 
 void UnarySmiOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   ASSERT(value == locs()->out(0).reg());
   switch (op_kind()) {
     case Token::kNEGATE: {
       Label* deopt = compiler->AddDeoptStub(deopt_id(), ICData::kDeoptUnaryOp);
       __ negl(value);
       __ j(OVERFLOW, deopt);
       break;
     }
     case Token::kBIT_NOT:
       __ notl(value);
       __ andl(value, Immediate(~kSmiTagMask));  // Remove inverted smi-tag.
       break;
     default:
       UNREACHABLE();
   }
 }
 
 
-LocationSummary* UnaryDoubleOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnaryDoubleOpInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void UnaryDoubleOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->in(0).fpu_reg();
   ASSERT(locs()->out(0).fpu_reg() == value);
   __ DoubleNegate(value);
 }
 
 
-LocationSummary* Int32ToDoubleInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* Int32ToDoubleInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   result->set_in(0, Location::RequiresRegister());
   result->set_out(0, Location::RequiresFpuRegister());
   return result;
 }
 
 
 void Int32ToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   FpuRegister result = locs()->out(0).fpu_reg();
   __ cvtsi2sd(result, value);
 }
 
 
-LocationSummary* SmiToDoubleInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* SmiToDoubleInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   result->set_in(0, Location::WritableRegister());
   result->set_out(0, Location::RequiresFpuRegister());
   return result;
 }
 
 
 void SmiToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   FpuRegister result = locs()->out(0).fpu_reg();
   __ SmiUntag(value);
   __ cvtsi2sd(result, value);
 }
 
 
-LocationSummary* MintToDoubleInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* MintToDoubleInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   result->set_in(0, Location::Pair(Location::RequiresRegister(),
                                    Location::RequiresRegister()));
   result->set_out(0, Location::RequiresFpuRegister());
   return result;
 }
 
 
 void MintToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   PairLocation* pair = locs()->in(0).AsPairLocation();
   Register in_lo = pair->At(0).reg();
   Register in_hi = pair->At(1).reg();
 
   FpuRegister result = locs()->out(0).fpu_reg();
 
   // Push hi.
   __ pushl(in_hi);
   // Push lo.
   __ pushl(in_lo);
   // Perform conversion from Mint to double.
   __ fildl(Address(ESP, 0));
   // Pop FPU stack onto regular stack.
   __ fstpl(Address(ESP, 0));
   // Copy into result.
   __ movsd(result, Address(ESP, 0));
   // Pop args.
   __ addl(ESP, Immediate(2 * kWordSize));
 }
 
 
-LocationSummary* DoubleToIntegerInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* DoubleToIntegerInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   result->set_in(0, Location::RegisterLocation(ECX));
   result->set_out(0, Location::RegisterLocation(EAX));
   return result;
 }
 
 
 void DoubleToIntegerInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register result = locs()->out(0).reg();
   Register value_obj = locs()->in(0).reg();
   XmmRegister value_double = XMM0;
@@ skipping 20 matching lines @@
                                instance_call()->token_pos(),
                                target,
                                kNumberOfArguments,
                                Object::null_array(),  // No argument names.
                                locs(),
                                ICData::Handle());
   __ Bind(&done);
 }
 
 
-LocationSummary* DoubleToSmiInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* DoubleToSmiInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   result->set_in(0, Location::RequiresFpuRegister());
   result->set_out(0, Location::RequiresRegister());
   return result;
 }
 
 
 void DoubleToSmiInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Label* deopt = compiler->AddDeoptStub(deopt_id(), ICData::kDeoptDoubleToSmi);
   Register result = locs()->out(0).reg();
   XmmRegister value = locs()->in(0).fpu_reg();
   __ cvttsd2si(result, value);
   // Check for overflow and that it fits into Smi.
   __ cmpl(result, Immediate(0xC0000000));
   __ j(NEGATIVE, deopt);
   __ SmiTag(result);
 }
 
 
-LocationSummary* DoubleToDoubleInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* DoubleToDoubleInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   result->set_in(0, Location::RequiresFpuRegister());
   result->set_out(0, Location::RequiresFpuRegister());
   return result;
 }
 
 
 void DoubleToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   XmmRegister value = locs()->in(0).fpu_reg();
   XmmRegister result = locs()->out(0).fpu_reg();
   switch (recognized_kind()) {
     case MethodRecognizer::kDoubleTruncate:
       __ roundsd(result, value,  Assembler::kRoundToZero);
       break;
     case MethodRecognizer::kDoubleFloor:
       __ roundsd(result, value,  Assembler::kRoundDown);
       break;
     case MethodRecognizer::kDoubleCeil:
       __ roundsd(result, value,  Assembler::kRoundUp);
       break;
     default:
       UNREACHABLE();
   }
 }
 
 
-LocationSummary* DoubleToFloatInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* DoubleToFloatInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   result->set_in(0, Location::RequiresFpuRegister());
   result->set_out(0, Location::SameAsFirstInput());
   return result;
 }
 
 
 void DoubleToFloatInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   __ cvtsd2ss(locs()->out(0).fpu_reg(), locs()->in(0).fpu_reg());
 }
 
 
-LocationSummary* FloatToDoubleInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* FloatToDoubleInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   result->set_in(0, Location::RequiresFpuRegister());
   result->set_out(0, Location::SameAsFirstInput());
   return result;
 }
 
 
 void FloatToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   __ cvtss2sd(locs()->out(0).fpu_reg(), locs()->in(0).fpu_reg());
 }
 
 
-LocationSummary* InvokeMathCFunctionInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* InvokeMathCFunctionInstr::MakeLocationSummary(Zone* zone,
                                                                bool opt) const {
   ASSERT((InputCount() == 1) || (InputCount() == 2));
   const intptr_t kNumTemps =
       (recognized_kind() == MethodRecognizer::kMathDoublePow) ? 3 : 1;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, InputCount(), kNumTemps, LocationSummary::kCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, InputCount(), kNumTemps, LocationSummary::kCall);
   // EDI is chosen because it is callee saved so we do not need to back it
   // up before calling into the runtime.
   result->set_temp(0, Location::RegisterLocation(EDI));
   result->set_in(0, Location::FpuRegisterLocation(XMM1));
   if (InputCount() == 2) {
     result->set_in(1, Location::FpuRegisterLocation(XMM2));
   }
   if (recognized_kind() == MethodRecognizer::kMathDoublePow) {
     // Temp index 1.
     result->set_temp(1, Location::RegisterLocation(EAX));
@@ skipping 151 matching lines @@
   }
 
   __ CallRuntime(TargetFunction(), InputCount());
   __ fstpl(Address(ESP, 0));
   __ movsd(locs()->out(0).fpu_reg(), Address(ESP, 0));
   // Restore ESP.
   __ movl(ESP, locs()->temp(kSavedSpTempIndex).reg());
 }
 
 
-LocationSummary* ExtractNthOutputInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* ExtractNthOutputInstr::MakeLocationSummary(Zone* zone,
                                                             bool opt) const {
   // Only use this instruction in optimized code.
   ASSERT(opt);
   const intptr_t kNumInputs = 1;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, 0, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, 0, LocationSummary::kNoCall);
   if (representation() == kUnboxedDouble) {
     if (index() == 0) {
       summary->set_in(0, Location::Pair(Location::RequiresFpuRegister(),
                                         Location::Any()));
     } else {
       ASSERT(index() == 1);
       summary->set_in(0, Location::Pair(Location::Any(),
                                         Location::RequiresFpuRegister()));
     }
     summary->set_out(0, Location::RequiresFpuRegister());
@@ skipping 23 matching lines @@
     __ movaps(out, in);
   } else {
     ASSERT(representation() == kTagged);
     Register out = locs()->out(0).reg();
     Register in = in_loc.reg();
     __ movl(out, in);
   }
 }
 
 
-LocationSummary* MergedMathInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* MergedMathInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
   if (kind() == MergedMathInstr::kTruncDivMod) {
     const intptr_t kNumInputs = 2;
     const intptr_t kNumTemps = 0;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     // Both inputs must be writable because they will be untagged.
     summary->set_in(0, Location::RegisterLocation(EAX));
     summary->set_in(1, Location::WritableRegister());
     // Output is a pair of registers.
     summary->set_out(0, Location::Pair(Location::RegisterLocation(EAX),
                                        Location::RegisterLocation(EDX)));
     return summary;
   }
   if (kind() == MergedMathInstr::kSinCos) {
     const intptr_t kNumInputs = 1;
     const intptr_t kNumTemps = 0;
-    LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresFpuRegister());
     summary->set_out(0, Location::Pair(Location::RequiresFpuRegister(),
                                        Location::RequiresFpuRegister()));
     return summary;
   }
   UNIMPLEMENTED();
   return NULL;
 }
 
 
@@ skipping 93 matching lines @@
     __ movsd(out2, Address(ESP, 0));
     __ addl(ESP, Immediate(2 * kWordSize));
     return;
   }
 
   UNIMPLEMENTED();
 }
 
 
 LocationSummary* PolymorphicInstanceCallInstr::MakeLocationSummary(
-    Isolate* isolate, bool opt) const {
-  return MakeCallSummary(isolate);
+    Zone* zone, bool opt) const {
+  return MakeCallSummary(zone);
 }
 
 
 void PolymorphicInstanceCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(ic_data().NumArgsTested() == 1);
   if (!with_checks()) {
     ASSERT(ic_data().HasOneTarget());
     const Function& target = Function::ZoneHandle(ic_data().GetTargetAt(0));
     compiler->GenerateStaticCall(deopt_id(),
                                  instance_call()->token_pos(),
@@ skipping 18 matching lines @@
                             EDI,  // Class id register.
                             instance_call()->ArgumentCount(),
                             instance_call()->argument_names(),
                             deopt,
                             deopt_id(),
                             instance_call()->token_pos(),
                             locs());
 }
 
 
-LocationSummary* BranchInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BranchInstr::MakeLocationSummary(Zone* zone,
                                                   bool opt) const {
-  comparison()->InitializeLocationSummary(isolate, opt);
+  comparison()->InitializeLocationSummary(zone, opt);
   // Branches don't produce a result.
   comparison()->locs()->set_out(0, Location::NoLocation());
   return comparison()->locs();
 }
 
 
 void BranchInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   comparison()->EmitBranchCode(compiler, this);
 }
 
 
-LocationSummary* CheckClassInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* CheckClassInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
   const intptr_t kNumInputs = 1;
   const bool need_mask_temp = IsDenseSwitch() && !IsDenseMask(ComputeCidMask());
   const intptr_t kNumTemps = !IsNullCheck() ? (need_mask_temp ? 2 : 1) : 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   if (!IsNullCheck()) {
     summary->set_temp(0, Location::RequiresRegister());
     if (need_mask_temp) {
       summary->set_temp(1, Location::RequiresRegister());
     }
   }
   return summary;
 }
 
@@ skipping 55 matching lines @@
         } else {
           __ j(EQUAL, &is_ok);
         }
       }
     }
   }
   __ Bind(&is_ok);
 }
 
 
-LocationSummary* CheckSmiInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* CheckSmiInstr::MakeLocationSummary(Zone* zone,
                                                     bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void CheckSmiInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   Label* deopt = compiler->AddDeoptStub(deopt_id(),
                                         ICData::kDeoptCheckSmi,
                                         licm_hoisted_ ? ICData::kHoisted : 0);
   __ testl(value, Immediate(kSmiTagMask));
   __ j(NOT_ZERO, deopt);
 }
 
 
-LocationSummary* CheckClassIdInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* CheckClassIdInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void CheckClassIdInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   Label* deopt = compiler->AddDeoptStub(deopt_id(), ICData::kDeoptCheckClass);
   __ cmpl(value, Immediate(Smi::RawValue(cid_)));
   __ j(NOT_ZERO, deopt);
 }
 
 
 // Length: register or constant.
 // Index: register, constant or stack slot.
-LocationSummary* CheckArrayBoundInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* CheckArrayBoundInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   if (length()->definition()->IsConstant()) {
     locs->set_in(kLengthPos, Location::RegisterOrSmiConstant(length()));
   } else {
     locs->set_in(kLengthPos, Location::PrefersRegister());
   }
   locs->set_in(kIndexPos, Location::RegisterOrSmiConstant(index()));
   return locs;
 }
 
 
@@ skipping 45 matching lines @@
     __ j(ABOVE_EQUAL, deopt);
   } else {
     Register index = index_loc.reg();
     Register length = length_loc.reg();
     __ cmpl(length, index);
     __ j(BELOW_EQUAL, deopt);
   }
 }
 
 
-LocationSummary* BinaryMintOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BinaryMintOpInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 2;
   switch (op_kind()) {
     case Token::kBIT_AND:
     case Token::kBIT_OR:
     case Token::kBIT_XOR:
     case Token::kADD:
     case Token::kSUB:
     case Token::kMUL: {
       const intptr_t kNumTemps = (op_kind() == Token::kMUL) ? 1 : 0;
-      LocationSummary* summary = new(isolate) LocationSummary(
-          isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      LocationSummary* summary = new(zone) LocationSummary(
+          zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
       summary->set_in(0, (op_kind() == Token::kMUL)
           ? Location::Pair(Location::RegisterLocation(EAX),
                            Location::RegisterLocation(EDX))
           : Location::Pair(Location::RequiresRegister(),
                            Location::RequiresRegister()));
       summary->set_in(1, Location::Pair(Location::RequiresRegister(),
                                         Location::RequiresRegister()));
       summary->set_out(0, Location::SameAsFirstInput());
       if (kNumTemps > 0) {
         summary->set_temp(0, Location::RequiresRegister());
@@ skipping 73 matching lines @@
     }
     default:
       UNREACHABLE();
   }
   if (FLAG_throw_on_javascript_int_overflow) {
     EmitJavascriptIntOverflowCheck(compiler, deopt, left_lo, left_hi);
   }
 }
 
 
-LocationSummary* ShiftMintOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* ShiftMintOpInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps =
       (op_kind() == Token::kSHL) && CanDeoptimize() ? 2 : 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::Pair(Location::RequiresRegister(),
                                     Location::RequiresRegister()));
   summary->set_in(1, Location::FixedRegisterOrSmiConstant(right(), ECX));
   if ((op_kind() == Token::kSHL) && CanDeoptimize()) {
     summary->set_temp(0, Location::RequiresRegister());
     summary->set_temp(1, Location::RequiresRegister());
   }
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
@@ skipping 174 matching lines @@
         UNREACHABLE();
     }
     __ Bind(&done);
   }
   if (FLAG_throw_on_javascript_int_overflow) {
     EmitJavascriptIntOverflowCheck(compiler, deopt, left_lo, left_hi);
   }
 }
 
 
-LocationSummary* UnaryMintOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnaryMintOpInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::Pair(Location::RequiresRegister(),
                                     Location::RequiresRegister()));
   summary->set_out(0, Location::SameAsFirstInput());
   if (FLAG_throw_on_javascript_int_overflow) {
     summary->set_temp(0, Location::RequiresRegister());
   }
   return summary;
 }
 
 
@@ skipping 30 matching lines @@
 CompileType ShiftUint32OpInstr::ComputeType() const {
   return CompileType::Int();
 }
 
 
 CompileType UnaryUint32OpInstr::ComputeType() const {
   return CompileType::Int();
 }
 
 
-LocationSummary* ShiftUint32OpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* ShiftUint32OpInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_in(1, Location::FixedRegisterOrSmiConstant(right(), ECX));
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void ShiftUint32OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const intptr_t kShifterLimit = 31;
 
@@ skipping 59 matching lines @@
 
   __ Bind(&zero);
   // Shift was greater than 31 bits, just return zero.
   __ xorl(left, left);
 
   // Exit path.
   __ Bind(&done);
 }
 
 
-LocationSummary* UnaryUint32OpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnaryUint32OpInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void UnaryUint32OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register out = locs()->out(0).reg();
   ASSERT(locs()->in(0).reg() == out);
 
   ASSERT(op_kind() == Token::kBIT_NOT);
 
   __ notl(out);
 }
 
 
-LocationSummary* UnboxedIntConverterInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnboxedIntConverterInstr::MakeLocationSummary(Zone* zone,
                                                                bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   if ((from() == kUnboxedInt32 || from() == kUnboxedUint32) &&
       (to() == kUnboxedInt32 || to() == kUnboxedUint32)) {
     summary->set_in(0, Location::RequiresRegister());
     summary->set_out(0, Location::SameAsFirstInput());
   } else if (from() == kUnboxedMint) {
     summary->set_in(0, Location::Pair(
         CanDeoptimize() ? Location::WritableRegister()
                         : Location::RequiresRegister(),
         Location::RequiresRegister()));
     summary->set_out(0, Location::RequiresRegister());
@@ skipping 59 matching lines @@
     Register out_hi = out_pair->At(1).reg();
     ASSERT(locs()->in(0).reg() == EAX);
     ASSERT(out_lo == EAX && out_hi == EDX);
     __ cdq();
   } else {
     UNREACHABLE();
   }
 }
 
 
-LocationSummary* ThrowInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* ThrowInstr::MakeLocationSummary(Zone* zone,
                                                  bool opt) const {
-  return new(isolate) LocationSummary(isolate, 0, 0, LocationSummary::kCall);
+  return new(zone) LocationSummary(zone, 0, 0, LocationSummary::kCall);
 }
 
 
 
 void ThrowInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   compiler->GenerateRuntimeCall(token_pos(),
                                 deopt_id(),
                                 kThrowRuntimeEntry,
                                 1,
                                 locs());
   __ int3();
 }
 
 
-LocationSummary* ReThrowInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* ReThrowInstr::MakeLocationSummary(Zone* zone,
                                                    bool opt) const {
-  return new(isolate) LocationSummary(isolate, 0, 0, LocationSummary::kCall);
+  return new(zone) LocationSummary(zone, 0, 0, LocationSummary::kCall);
 }
 
 
 void ReThrowInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   compiler->SetNeedsStacktrace(catch_try_index());
   compiler->GenerateRuntimeCall(token_pos(),
                                 deopt_id(),
                                 kReThrowRuntimeEntry,
                                 2,
                                 locs());
   __ int3();
 }
 
 
 void GraphEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (!compiler->CanFallThroughTo(normal_entry())) {
     __ jmp(compiler->GetJumpLabel(normal_entry()));
   }
 }
 
 
-LocationSummary* GotoInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* GotoInstr::MakeLocationSummary(Zone* zone,
                                                 bool opt) const {
-  return new(isolate) LocationSummary(isolate, 0, 0, LocationSummary::kNoCall);
+  return new(zone) LocationSummary(zone, 0, 0, LocationSummary::kNoCall);
 }
 
 
 void GotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (!compiler->is_optimizing()) {
     if (FLAG_emit_edge_counters) {
       compiler->EmitEdgeCounter();
     }
     // Add a deoptimization descriptor for deoptimizing instructions that
     // may be inserted before this instruction.  This descriptor points
     // after the edge counter for uniformity with ARM and MIPS, where we can
     // reuse pattern matching that matches backwards from the end of the
     // pattern.
     compiler->AddCurrentDescriptor(RawPcDescriptors::kDeopt,
                                    GetDeoptId(),
                                    Scanner::kNoSourcePos);
   }
   if (HasParallelMove()) {
     compiler->parallel_move_resolver()->EmitNativeCode(parallel_move());
   }
 
   // We can fall through if the successor is the next block in the list.
   // Otherwise, we need a jump.
   if (!compiler->CanFallThroughTo(successor())) {
     __ jmp(compiler->GetJumpLabel(successor()));
   }
 }
 
 
-LocationSummary* IndirectGotoInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* IndirectGotoInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 1;
 
-  LocationSummary* summary = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
 
   summary->set_in(0, Location::RequiresRegister());
   summary->set_temp(0, Location::RequiresRegister());
 
   return summary;
 }
 
 
 void IndirectGotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register target_address_reg = locs()->temp_slot(0)->reg();
 
   // Load from [current frame pointer] + kPcMarkerSlotFromFp.
   __ movl(target_address_reg, Address(EBP, kPcMarkerSlotFromFp * kWordSize));
 
   // Add the offset.
   Register offset_reg = locs()->in(0).reg();
   if (offset()->definition()->representation() == kTagged) {
     __ SmiUntag(offset_reg);
   }
   __ addl(target_address_reg, offset_reg);
 
   // Jump to the absolute address.
   __ jmp(target_address_reg);
 }
 
 
-LocationSummary* StrictCompareInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* StrictCompareInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   if (needs_number_check()) {
-    LocationSummary* locs = new(isolate) LocationSummary(
-        isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+    LocationSummary* locs = new(zone) LocationSummary(
+        zone, kNumInputs, kNumTemps, LocationSummary::kCall);
     locs->set_in(0, Location::RegisterLocation(EAX));
     locs->set_in(1, Location::RegisterLocation(ECX));
     locs->set_out(0, Location::RegisterLocation(EAX));
     return locs;
   }
-  LocationSummary* locs = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  LocationSummary* locs = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::RegisterOrConstant(left()));
   // Only one of the inputs can be a constant. Choose register if the first one
   // is a constant.
   locs->set_in(1, locs->in(0).IsConstant()
                       ? Location::RequiresRegister()
                       : Location::RegisterOrConstant(right()));
   locs->set_out(0, Location::RequiresRegister());
   return locs;
 }
 
@@ skipping 57 matching lines @@
 }
 
 
 // Detect pattern when one value is zero and another is a power of 2.
 static bool IsPowerOfTwoKind(intptr_t v1, intptr_t v2) {
   return (Utils::IsPowerOfTwo(v1) && (v2 == 0)) ||
          (Utils::IsPowerOfTwo(v2) && (v1 == 0));
 }
 
 
-LocationSummary* IfThenElseInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* IfThenElseInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
-  comparison()->InitializeLocationSummary(isolate, opt);
+  comparison()->InitializeLocationSummary(zone, opt);
   // TODO(vegorov): support byte register constraints in the register allocator.
   comparison()->locs()->set_out(0, Location::RegisterLocation(EDX));
   return comparison()->locs();
 }
 
 
 void IfThenElseInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->out(0).reg() == EDX);
 
   // Clear upper part of the out register. We are going to use setcc on it
@@ skipping 35 matching lines @@
     __ decl(EDX);
     __ andl(EDX, Immediate(
         Smi::RawValue(true_value) - Smi::RawValue(false_value)));
     if (false_value != 0) {
       __ addl(EDX, Immediate(Smi::RawValue(false_value)));
     }
   }
 }
 
 
-LocationSummary* ClosureCallInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* ClosureCallInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCall);
   summary->set_in(0, Location::RegisterLocation(EAX));  // Function.
   summary->set_out(0, Location::RegisterLocation(EAX));
   return summary;
 }
 
 
 void ClosureCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // Load arguments descriptors.
   intptr_t argument_count = ArgumentCount();
   const Array& arguments_descriptor =
@@ skipping 24 matching lines @@
     // Add deoptimization continuation point after the call and before the
     // arguments are removed.
     compiler->AddCurrentDescriptor(RawPcDescriptors::kDeopt,
                                    deopt_id_after,
                                    token_pos());
   }
   __ Drop(argument_count);
 }
 
 
-LocationSummary* BooleanNegateInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BooleanNegateInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                1,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void BooleanNegateInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   Register result = locs()->out(0).reg();
 
   Label done;
   __ LoadObject(result, Bool::True());
   __ CompareRegisters(result, value);
   __ j(NOT_EQUAL, &done, Assembler::kNearJump);
   __ LoadObject(result, Bool::False());
   __ Bind(&done);
 }
 
 
-LocationSummary* AllocateObjectInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* AllocateObjectInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
-  return MakeCallSummary(isolate);
+  return MakeCallSummary(zone);
 }
 
 
 void AllocateObjectInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Isolate* isolate = compiler->isolate();
   StubCode* stub_code = isolate->stub_code();
   const Code& stub = Code::Handle(isolate,
                                   stub_code->GetAllocationStubForClass(cls()));
   const ExternalLabel label(stub.EntryPoint());
   compiler->GenerateCall(token_pos(),
@@ skipping 13 matching lines @@
 #if defined(DEBUG)
   __ movl(EDX, Immediate(kInvalidObjectPointer));
 #endif
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_IA32