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

runtime/vm/intermediate_language_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 13 matching lines @@
 namespace dart {
 
 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, use_osr);
 
 // Generic summary for call instructions that have all arguments pushed
 // on the stack and return the result in a fixed register R0.
-LocationSummary* Instruction::MakeCallSummary(Isolate* isolate) {
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, 0, 0, LocationSummary::kCall);
+LocationSummary* Instruction::MakeCallSummary(Zone* zone) {
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, 0, 0, LocationSummary::kCall);
   result->set_out(0, Location::RegisterLocation(R0));
   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()) {
       __ Push(value.reg());
     } else if (value.IsConstant()) {
       __ PushObject(value.constant(), PP);
     } else {
       ASSERT(value.IsStackSlot());
       const intptr_t value_offset = value.ToStackSlotOffset();
       __ LoadFromOffset(TMP, value.base_reg(), value_offset, PP);
       __ Push(TMP);
     }
   }
 }
 
 
-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(R0));
   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 instructions: a branch macro sequence.
 void ReturnInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register result = locs()->in(0).reg();
@@ skipping 41 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);
   return comparison()->locs();
 }
 
 
 void IfThenElseInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register result = locs()->out(0).reg();
 
   Location left = locs()->in(0);
   Location right = locs()->in(1);
   ASSERT(!left.IsConstant() || !right.IsConstant());
@@ skipping 34 matching lines @@
     const int64_t val =
         Smi::RawValue(true_value) - Smi::RawValue(false_value);
     __ AndImmediate(result, result, val, PP);
     if (false_value != 0) {
       __ AddImmediate(result, result, Smi::RawValue(false_value), PP);
     }
   }
 }
 
 
-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(R0));  // Function.
   summary->set_out(0, Location::RegisterLocation(R0));
   return summary;
 }
 
 
 void ClosureCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // Load arguments descriptor in R4.
   int 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* LoadLocalInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* LoadLocalInstr::MakeLocationSummary(Zone* zone,
                                                      bool opt) const {
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                0,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadLocalInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register result = locs()->out(0).reg();
   __ LoadFromOffset(result, FP, local().index() * kWordSize, PP);
 }
 
 
-LocationSummary* StoreLocalInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* StoreLocalInstr::MakeLocationSummary(Zone* zone,
                                                       bool opt) const {
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                1,
                                Location::SameAsFirstInput(),
                                LocationSummary::kNoCall);
 }
 
 
 void StoreLocalInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register value = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
   ASSERT(result == value);  // Assert that register assignment is correct.
   __ StoreToOffset(value, FP, local().index() * kWordSize, PP);
 }
 
 
-LocationSummary* ConstantInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* ConstantInstr::MakeLocationSummary(Zone* zone,
                                                     bool opt) const {
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                0,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void ConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // The register allocator drops constant definitions that have no uses.
   if (!locs()->out(0).IsInvalid()) {
     const Register result = locs()->out(0).reg();
     __ LoadObject(result, value(), PP);
   }
 }
 
 
-LocationSummary* UnboxedConstantInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnboxedConstantInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 0;
   const Location out = (representation_ == kUnboxedInt32) ?
       Location::RequiresRegister() : Location::RequiresFpuRegister();
-  return LocationSummary::Make(isolate,
+  return LocationSummary::Make(zone,
                                kNumInputs,
                                out,
                                LocationSummary::kNoCall);
 }
 
 
 void UnboxedConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (!locs()->out(0).IsInvalid()) {
     switch (representation_) {
       case kUnboxedDouble:
@@ skipping 11 matching lines @@
                          PP);
         break;
       default:
         UNREACHABLE();
         break;
     }
   }
 }
 
 
-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(R0));  // Value.
   summary->set_in(1, Location::RegisterLocation(R2));  // Instantiator.
   summary->set_in(2, Location::RegisterLocation(R1));  // Type arguments.
   summary->set_out(0, Location::RegisterLocation(R0));
   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(R0));
   locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 static void EmitAssertBoolean(Register reg,
                               intptr_t token_pos,
                               intptr_t deopt_id,
                               LocationSummary* locs,
@@ skipping 102 matching lines @@
     true_condition = FlipCondition(true_condition);
   } else if (right.IsConstant()) {
     __ CompareObject(left.reg(), right.constant(), PP);
   } else {
     __ CompareRegisters(left.reg(), right.reg());
   }
   return true_condition;
 }
 
 
-LocationSummary* EqualityCompareInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* EqualityCompareInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 2;
   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 71 matching lines @@
   Condition true_condition = EmitComparisonCode(compiler, labels);
   if ((operation_cid() == kDoubleCid) && (true_condition != NE)) {
     // Special case for NaN comparison. Result is always false unless
     // relational operator is !=.
     __ b(labels.false_label, VS);
   }
   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 19 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 49 matching lines @@
   // True or False into result.
   __ Bind(&is_false);
   __ LoadObject(result_reg, Bool::False(), PP);
   __ b(&done);
   __ Bind(&is_true);
   __ LoadObject(result_reg, Bool::True(), PP);
   __ 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() == 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 38 matching lines @@
   Condition true_condition = EmitComparisonCode(compiler, labels);
   if ((operation_cid() == kDoubleCid) && (true_condition != NE)) {
     // Special case for NaN comparison. Result is always false unless
     // relational operator is !=.
     __ b(labels.false_label, VS);
   }
   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) {
   const Register result = locs()->out(0).reg();
 
   // Push the result place holder initialized to NULL.
   __ PushObject(Object::null_object(), PP);
   // Pass a pointer to the first argument in R2.
   if (!function().HasOptionalParameters()) {
@@ skipping 32 matching lines @@
   __ LoadImmediate(R5, entry, PP);
   __ LoadImmediate(R1, argc_tag, PP);
   compiler->GenerateCall(token_pos(),
                          stub_entry,
                          RawPcDescriptors::kOther,
                          locs());
   __ Pop(result);
 }
 
 
-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) {
   const Register char_code = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
   __ LoadImmediate(
       result, reinterpret_cast<uword>(Symbols::PredefinedAddress()), PP);
   __ AddImmediate(
       result, result, Symbols::kNullCharCodeSymbolOffset * kWordSize, PP);
   __ SmiUntag(TMP, char_code);  // Untag to use scaled adress mode.
   __ ldr(result, Address(result, TMP, UXTX, Address::Scaled));
 }
 
 
-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);
   const Register str = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
   __ LoadFieldFromOffset(result, str, String::length_offset(), PP);
   __ ldr(TMP, FieldAddress(str, OneByteString::data_offset()), kUnsignedByte);
   __ CompareImmediate(result, Smi::RawValue(1), PP);
   __ LoadImmediate(result, -1, PP);
   __ csel(result, TMP, result, EQ);
   __ SmiTag(result);
 }
 
 
-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(R0));
   summary->set_out(0, Location::RegisterLocation(R0));
   return summary;
 }
 
 
 void StringInterpolateInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register array = locs()->in(0).reg();
   __ Push(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() == R0);
 }
 
 
-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::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadUntaggedInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register obj = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
   if (object()->definition()->representation() == kUntagged) {
     __ LoadFromOffset(result, obj, offset(), PP);
   } else {
     ASSERT(object()->definition()->representation() == kTagged);
     __ LoadFieldFromOffset(result, obj, offset(), PP);
   }
 }
 
 
-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();
   static const intptr_t kSmiCidSource = kSmiCid << RawObject::kClassIdTagPos;
@@ skipping 87 matching lines @@
       (is_external ? 0 : (Instance::DataOffsetFor(cid) - kHeapObjectTag));
   if (!Utils::IsInt(32, offset)) {
     return false;
   }
   return Address::CanHoldOffset(static_cast<int32_t>(offset),
                                 Address::Offset,
                                 Address::OperandSizeFor(cid));
 }
 
 
-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(), IsExternal())) {
     locs->set_in(1, Location::Constant(index()->definition()->AsConstant()));
   } else {
     locs->set_in(1, Location::RequiresRegister());
   }
   if ((representation() == kUnboxedDouble)    ||
       (representation() == kUnboxedFloat32x4) ||
       (representation() == kUnboxedInt32x4)   ||
       (representation() == kUnboxedFloat64x2)) {
@@ skipping 89 matching lines @@
       __ SmiTag(result);
       break;
     default:
       ASSERT((class_id() == kArrayCid) || (class_id() == kImmutableArrayCid));
       __ ldr(result, element_address);
       break;
   }
 }
 
 
-LocationSummary* LoadCodeUnitsInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* LoadCodeUnitsInstr::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::RequiresRegister());
   summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void LoadCodeUnitsInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // The string register points to the backing store for external strings.
   const Register str = locs()->in(0).reg();
@@ skipping 61 matching lines @@
       return kUnboxedInt32x4;
     case kTypedDataFloat64x2ArrayCid:
       return kUnboxedFloat64x2;
     default:
       UNREACHABLE();
       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(), IsExternal())) {
     locs->set_in(1, Location::Constant(index()->definition()->AsConstant()));
   } else {
     locs->set_in(1, Location::WritableRegister());
   }
   switch (class_id()) {
     case kArrayCid:
       locs->set_in(2, ShouldEmitStoreBarrier()
                         ? Location::WritableRegister()
@@ skipping 141 matching lines @@
   if (value_is_smi == NULL) {
     __ b(&done, EQ);
   } else {
     __ b(value_is_smi, EQ);
   }
   __ LoadClassId(value_cid_reg, value_reg, PP);
   __ Bind(&done);
 }
 
 
-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 = emit_full_guard ||
       ((value_cid == kDynamicCid) && (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 122 matching lines @@
     } else {
       // Both value's and field's class id is known.
       ASSERT((value_cid != field_cid) && (value_cid != nullability));
       __ b(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 139 matching lines @@
   __ CompareObject(box_reg, Object::null_object(), PP);
   __ b(&done, NE);
   BoxAllocationSlowPath::Allocate(
       compiler, instruction, cls, box_reg, temp);
   __ mov(temp, box_reg);
   __ StoreIntoObjectOffset(instance_reg, offset, temp, PP);
   __ Bind(&done);
 }
 
 
-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()) ? 2 : 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 175 matching lines @@
           instance_reg,
           offset_in_bytes_,
           value_reg,
           PP);
     }
   }
   __ 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());
   summary->set_out(0, Location::RequiresRegister());
   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) {
   const Register field = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
   __ LoadFieldFromOffset(result, field, Field::value_offset(), PP);
 }
 
 
-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) {
   const Register value = locs()->in(0).reg();
   const Register temp = locs()->temp(0).reg();
 
   __ LoadObject(temp, field(), PP);
   if (this->value()->NeedsStoreBuffer()) {
     __ StoreIntoObjectOffset(
         temp, Field::value_offset(), value, PP, CanValueBeSmi());
   } else {
     __ StoreIntoObjectOffsetNoBarrier(temp, Field::value_offset(), value, PP);
   }
 }
 
 
-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(R0));
   summary->set_in(1, Location::RegisterLocation(R2));
   summary->set_in(2, Location::RegisterLocation(R1));
   summary->set_out(0, Location::RegisterLocation(R0));
   return summary;
 }
 
 
 void InstanceOfInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->in(0).reg() == R0);  // Value.
   ASSERT(locs()->in(1).reg() == R2);  // Instantiator.
   ASSERT(locs()->in(2).reg() == R1);  // Instantiator type arguments.
 
   compiler->GenerateInstanceOf(token_pos(),
                                deopt_id(),
                                type(),
                                negate_result(),
                                locs());
   ASSERT(locs()->out(0).reg() == R0);
 }
 
 
-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(kElementTypePos, Location::RegisterLocation(R1));
   locs->set_in(kLengthPos, Location::RegisterLocation(R2));
   locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 // Inlines array allocation for known constant values.
 static void InlineArrayAllocation(FlowGraphCompiler* compiler,
                                    intptr_t num_elements,
@@ skipping 89 matching lines @@
   const ExternalLabel label(stub.EntryPoint());
   compiler->GenerateCall(token_pos(),
                          &label,
                          RawPcDescriptors::kOther,
                          locs());
   compiler->AddStubCallTarget(stub);
   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()) ? 1 : 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, Location::RequiresRegister());
@@ skipping 106 matching lines @@
       __ b(&done);
     }
 
     __ Bind(&load_pointer);
   }
   __ LoadFieldFromOffset(result_reg, instance_reg, offset_in_bytes(), PP);
   __ 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(R0));
   locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 void InstantiateTypeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register instantiator_reg = locs()->in(0).reg();
   const 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(), PP);  // Make room for the result.
   __ PushObject(type(), PP);
   __ Push(instantiator_reg);  // Push instantiator type arguments.
   compiler->GenerateRuntimeCall(token_pos(),
                                 deopt_id(),
                                 kInstantiateTypeRuntimeEntry,
                                 2,
                                 locs());
   __ Drop(2);  // Drop instantiator and uninstantiated type.
   __ Pop(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(R0));
   locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 void InstantiateTypeArgumentsInstr::EmitNativeCode(
     FlowGraphCompiler* compiler) {
   const Register instantiator_reg = locs()->in(0).reg();
   const Register result_reg = locs()->out(0).reg();
@@ skipping 43 matching lines @@
                                 kInstantiateTypeArgumentsRuntimeEntry,
                                 2,
                                 locs());
   __ Drop(2);  // Drop instantiator and uninstantiated type arguments.
   __ Pop(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 = 3;
-  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(R1));
   locs->set_temp(1, Location::RegisterLocation(R2));
   locs->set_temp(2, Location::RegisterLocation(R3));
   locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 class AllocateContextSlowPath : public SlowPathCode {
  public:
@@ skipping 46 matching lines @@
                       temp2);
 
   // Setup up number of context variables field.
   __ LoadImmediate(temp0, num_context_variables(), PP);
   __ str(temp0, FieldAddress(result, Context::num_variables_offset()));
 
   __ 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(R1));
   locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 void AllocateContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->temp(0).reg() == R1);
   ASSERT(locs()->out(0).reg() == R0);
 
   __ LoadImmediate(R1, num_context_variables(), PP);
   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(R0));
   locs->set_temp(0, Location::RegisterLocation(R1));
   return locs;
 }
 
 
 void InitStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register field = locs()->in(0).reg();
   Register temp = locs()->temp(0).reg();
   Label call_runtime, no_call;
@@ skipping 11 matching lines @@
   compiler->GenerateRuntimeCall(token_pos(),
                                 deopt_id(),
                                 kInitStaticFieldRuntimeEntry,
                                 1,
                                 locs());
   __ Drop(2);  // Remove argument and result placeholder.
   __ 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(R0));
   locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 void CloneContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register context_value = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
 
   __ PushObject(Object::null_object(), PP);  // Make room for the result.
   __ Push(context_value);
   compiler->GenerateRuntimeCall(token_pos(),
                                 deopt_id(),
                                 kCloneContextRuntimeEntry,
                                 1,
                                 locs());
   __ Drop(1);  // Remove argument.
   __ Pop(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 17 matching lines @@
 
   // Restore stack and initialize the two exception variables:
   // exception and stack trace variables.
   __ StoreToOffset(kExceptionObjectReg,
                    FP, exception_var().index() * kWordSize, PP);
   __ StoreToOffset(kStackTraceObjectReg,
                    FP, stacktrace_var().index() * kWordSize, PP);
 }
 
 
-LocationSummary* CheckStackOverflowInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* CheckStackOverflowInstr::MakeLocationSummary(Zone* zone,
                                                               bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 1;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kCallOnSlowPath);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCallOnSlowPath);
   summary->set_temp(0, Location::RequiresRegister());
   return summary;
 }
 
 
 class CheckStackOverflowSlowPath : public SlowPathCode {
  public:
   explicit CheckStackOverflowSlowPath(CheckStackOverflowInstr* instruction)
       : instruction_(instruction) { }
 
@@ skipping 186 matching lines @@
     __ b(deopt, NE);  // Overflow.
     // Shift for result now we know there is no overflow.
     __ lslv(result, left, TMP);
   }
   if (FLAG_throw_on_javascript_int_overflow) {
     EmitJavascriptOverflowCheck(compiler, shift_left->range(), deopt, result);
   }
 }
 
 
-LocationSummary* BinarySmiOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BinarySmiOpInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps =
       (((op_kind() == Token::kSHL) && can_overflow()) ||
        (op_kind() == Token::kSHR)) ? 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::kTRUNCDIV) {
     summary->set_in(0, Location::RequiresRegister());
     if (RightIsPowerOfTwoConstant()) {
       ConstantInstr* right_constant = right()->definition()->AsConstant();
       summary->set_in(1, Location::Constant(right_constant));
     } else {
       summary->set_in(1, Location::RequiresRegister());
     }
     summary->set_out(0, Location::RequiresRegister());
     return summary;
@@ skipping 255 matching lines @@
     default:
       UNREACHABLE();
       break;
   }
   if (FLAG_throw_on_javascript_int_overflow) {
     EmitJavascriptOverflowCheck(compiler, range(), deopt, result);
   }
 }
 
 
-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 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());
   return summary;
 }
 
 
 void CheckEitherNonSmiInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Label* deopt = compiler->AddDeoptStub(deopt_id(),
                                         ICData::kDeoptBinaryDoubleOp,
                                         licm_hoisted_ ? ICData::kHoisted : 0);
   intptr_t left_cid = left()->Type()->ToCid();
   intptr_t right_cid = right()->Type()->ToCid();
   const Register left = locs()->in(0).reg();
   const Register right = locs()->in(1).reg();
   if (left_cid == kSmiCid) {
     __ tsti(right, Immediate(kSmiTagMask));
   } else if (right_cid == kSmiCid) {
     __ tsti(left, Immediate(kSmiTagMask));
   } else {
     __ orr(TMP, left, Operand(right));
     __ tsti(TMP, Immediate(kSmiTagMask));
   }
   __ b(deopt, EQ);
 }
 
 
-LocationSummary* BoxInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BoxInstr::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::kCallOnSlowPath);
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kCallOnSlowPath);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_temp(0, Location::RequiresRegister());
   summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void BoxInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register out_reg = locs()->out(0).reg();
   const Register temp_reg = locs()->temp(0).reg();
@@ skipping 15 matching lines @@
     case kUnboxedInt32x4:
       __ StoreQFieldToOffset(value, out_reg, ValueOffset(), PP);
       break;
     default:
       UNREACHABLE();
       break;
   }
 }
 
 
-LocationSummary* UnboxInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnboxInstr::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::RequiresFpuRegister());
   return summary;
 }
 
 
 void UnboxInstr::EmitLoadFromBox(FlowGraphCompiler* compiler) {
   const Register box = locs()->in(0).reg();
 
   switch (representation()) {
@@ skipping 77 matching lines @@
       Label done;
       __ b(&done);
       __ Bind(&is_smi);
       EmitSmiConversion(compiler);
       __ Bind(&done);
     }
   }
 }
 
 
-LocationSummary* BoxInteger32Instr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BoxInteger32Instr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   ASSERT((from_representation() == kUnboxedInt32) ||
          (from_representation() == kUnboxedUint32));
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
-  LocationSummary* summary = new(isolate) LocationSummary(
-      isolate,
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone,
       kNumInputs,
       kNumTemps,
       LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void BoxInteger32Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   Register out = locs()->out(0).reg();
   ASSERT(value != out);
 
   ASSERT(kSmiTagSize == 1);
   // TODO(vegorov) implement and use UBFM/SBFM for this.
   __ LslImmediate(out, value, 32);
   if (from_representation() == kUnboxedInt32) {
     __ AsrImmediate(out, out, 32 - kSmiTagSize);
   } else {
     ASSERT(from_representation() == kUnboxedUint32);
     __ LsrImmediate(out, out, 32 - kSmiTagSize);
   }
 }
 
 
 DEFINE_UNIMPLEMENTED_INSTRUCTION(BoxInt64Instr)
 
 
-LocationSummary* UnboxInteger32Instr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnboxInteger32Instr::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::RequiresRegister());
   return summary;
 }
 
 
 void UnboxInteger32Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const intptr_t value_cid = value()->Type()->ToCid();
   const Register out = locs()->out(0).reg();
   const Register value = locs()->in(0).reg();
@@ skipping 18 matching lines @@
   // TODO(vegorov): as it is implemented right now truncating unboxing would
   // leave "garbage" in the higher word.
   if (!is_truncating() && (deopt != NULL)) {
     ASSERT(representation() == kUnboxedInt32);
     __ cmp(out, Operand(out, SXTW, 0));
     __ b(deopt, NE);
   }
 }
 
 
-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::RequiresFpuRegister());
   return summary;
 }
 
 
 void BinaryDoubleOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister right = locs()->in(1).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
   switch (op_kind()) {
     case Token::kADD: __ faddd(result, left, right); break;
     case Token::kSUB: __ fsubd(result, left, right); break;
     case Token::kMUL: __ fmuld(result, left, right); break;
     case Token::kDIV: __ fdivd(result, 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::RequiresFpuRegister());
   return summary;
 }
 
 
 void BinaryFloat32x4OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister right = locs()->in(1).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case Token::kADD: __ vadds(result, left, right); break;
     case Token::kSUB: __ vsubs(result, left, right); break;
     case Token::kMUL: __ vmuls(result, left, right); break;
     case Token::kDIV: __ vdivs(result, 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::RequiresFpuRegister());
   return summary;
 }
 
 
 void BinaryFloat64x2OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister right = locs()->in(1).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case Token::kADD: __ vaddd(result, left, right); break;
     case Token::kSUB: __ vsubd(result, left, right); break;
     case Token::kMUL: __ vmuld(result, left, right); break;
     case Token::kDIV: __ vdivd(result, 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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Simd32x4ShuffleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister value = locs()->in(0).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
@@ skipping 29 matching lines @@
         __ vinss(result, 1, value, (mask_ >> 2) & 0x3);
         __ vinss(result, 2, value, (mask_ >> 4) & 0x3);
         __ vinss(result, 3, value, (mask_ >> 6) & 0x3);
       }
       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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Simd32x4ShuffleMixInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister right = locs()->in(1).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4ShuffleMix:
     case MethodRecognizer::kInt32x4ShuffleMix:
       __ vinss(result, 0, left, mask_ & 0x3);
       __ vinss(result, 1, left, (mask_ >> 2) & 0x3);
       __ vinss(result, 2, right, (mask_ >> 4) & 0x3);
       __ vinss(result, 3, right, (mask_ >> 6) & 0x3);
       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 = 1;
   LocationSummary* summary =  new LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_temp(0, Location::RequiresRegister());
   summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void Simd32x4GetSignMaskInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister value = locs()->in(0).fpu_reg();
   const Register out = locs()->out(0).reg();
@@ skipping 13 matching lines @@
   // W lane.
   __ vmovrs(temp, value, 3);
   __ LsrImmediate(temp, temp, 31);
   __ orr(out, out, Operand(temp, LSL, 3));
   // Tag.
   __ 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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ConstructorInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister v0 = locs()->in(0).fpu_reg();
   const VRegister v1 = locs()->in(1).fpu_reg();
   const VRegister v2 = locs()->in(2).fpu_reg();
   const VRegister v3 = locs()->in(3).fpu_reg();
   const VRegister r = locs()->out(0).fpu_reg();
 
   __ fcvtsd(VTMP, v0);
   __ vinss(r, 0, VTMP, 0);
   __ fcvtsd(VTMP, v1);
   __ vinss(r, 1, VTMP, 0);
   __ fcvtsd(VTMP, v2);
   __ vinss(r, 2, VTMP, 0);
   __ fcvtsd(VTMP, v3);
   __ vinss(r, 3, VTMP, 0);
 }
 
 
-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) {
   const VRegister v = locs()->out(0).fpu_reg();
   __ veor(v, v, v);
 }
 
 
-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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4SplatInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister value = locs()->in(0).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   // Convert to Float32.
   __ fcvtsd(VTMP, value);
 
   // Splat across all lanes.
   __ vdups(result, VTMP, 0);
 }
 
 
-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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ComparisonInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister right = locs()->in(1).fpu_reg();
@@ skipping 19 matching lines @@
       break;
     case MethodRecognizer::kFloat32x4LessThanOrEqual:
       __ vcges(result, right, left);
       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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4MinMaxInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister right = locs()->in(1).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Min:
       __ vmins(result, left, right);
       break;
     case MethodRecognizer::kFloat32x4Max:
       __ vmaxs(result, 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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4SqrtInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Sqrt:
       __ vsqrts(result, left);
       break;
     case MethodRecognizer::kFloat32x4Reciprocal:
       __ VRecps(result, left);
       break;
     case MethodRecognizer::kFloat32x4ReciprocalSqrt:
       __ VRSqrts(result, left);
       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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ScaleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister right = locs()->in(1).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Scale:
       __ fcvtsd(VTMP, left);
       __ vdups(result, VTMP, 0);
       __ vmuls(result, result, right);
       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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ZeroArgInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Negate:
       __ vnegs(result, left);
       break;
     case MethodRecognizer::kFloat32x4Absolute:
       __ vabss(result, 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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ClampInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister lower = locs()->in(1).fpu_reg();
   const VRegister upper = locs()->in(2).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
   __ vmins(result, left, upper);
   __ vmaxs(result, result, 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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4WithInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister replacement = locs()->in(0).fpu_reg();
   const VRegister value = locs()->in(1).fpu_reg();
@@ skipping 15 matching lines @@
       __ vinss(result, 2, VTMP, 0);
       break;
     case MethodRecognizer::kFloat32x4WithW:
       __ vinss(result, 3, VTMP, 0);
       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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ToInt32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister value = locs()->in(0).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   if (value != result) {
     __ vmov(result, value);
   }
 }
 
 
-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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Simd64x2ShuffleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister value = locs()->in(0).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat64x2GetX:
       __ vinsd(result, 0, value, 0);
       break;
     case MethodRecognizer::kFloat64x2GetY:
       __ vinsd(result, 0, value, 1);
       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) {
   const VRegister v = locs()->out(0).fpu_reg();
   __ veor(v, v, v);
 }
 
 
-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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float64x2SplatInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister value = locs()->in(0).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
   __ vdupd(result, value, 0);
 }
 
 
 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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float64x2ConstructorInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister v0 = locs()->in(0).fpu_reg();
   const VRegister v1 = locs()->in(1).fpu_reg();
   const VRegister r = locs()->out(0).fpu_reg();
   __ vinsd(r, 0, v0, 0);
   __ vinsd(r, 1, v1, 0);
 }
 
 
 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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float64x2ToFloat32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister q = locs()->in(0).fpu_reg();
   const VRegister r = locs()->out(0).fpu_reg();
 
   // Zero register.
   __ veor(r, r, r);
   // Set X lane.
   __ vinsd(VTMP, 0, q, 0);
   __ fcvtsd(VTMP, VTMP);
   __ vinss(r, 0, VTMP, 0);
   // Set Y lane.
   __ vinsd(VTMP, 0, q, 1);
   __ fcvtsd(VTMP, VTMP);
   __ vinss(r, 1, VTMP, 0);
 }
 
 
 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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ToFloat64x2Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister q = locs()->in(0).fpu_reg();
   const VRegister r = locs()->out(0).fpu_reg();
 
   // Set X.
   __ vinss(VTMP, 0, q, 0);
   __ fcvtds(VTMP, VTMP);
   __ vinsd(r, 0, VTMP, 0);
   // Set Y.
   __ vinss(VTMP, 0, q, 1);
   __ fcvtds(VTMP, VTMP);
   __ vinsd(r, 1, VTMP, 0);
 }
 
 
-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);
 
   if (representation() == kTagged) {
     ASSERT(op_kind() == MethodRecognizer::kFloat64x2GetSignMask);
     summary->set_in(0, Location::RequiresFpuRegister());
     summary->set_out(0, Location::RequiresRegister());
   } else {
     summary->set_in(0, Location::RequiresFpuRegister());
     summary->set_out(0, Location::RequiresFpuRegister());
   }
   return summary;
@@ skipping 28 matching lines @@
       __ vabsd(result, value);
       break;
     case MethodRecognizer::kFloat64x2Sqrt:
       __ vsqrtd(result, value);
       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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      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) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister right = locs()->in(1).fpu_reg();
@@ skipping 16 matching lines @@
       break;
     case MethodRecognizer::kFloat64x2Max:
       __ vmaxd(out, 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) {
   const Register v0 = locs()->in(0).reg();
   const Register v1 = locs()->in(1).reg();
   const Register v2 = locs()->in(2).reg();
   const Register v3 = locs()->in(3).reg();
   const VRegister result = locs()->out(0).fpu_reg();
   __ veor(result, result, result);
   __ vinsw(result, 0, v0);
   __ vinsw(result, 1, v1);
   __ vinsw(result, 2, v2);
   __ vinsw(result, 3, v3);
 }
 
 
 LocationSummary* Int32x4BoolConstructorInstr::MakeLocationSummary(
-    Isolate* isolate, bool opt) const {
+    Zone* zone, bool opt) const {
   const intptr_t kNumInputs = 4;
   const intptr_t kNumTemps = 1;
   LocationSummary* summary = new LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      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_temp(0, Location::RequiresRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
@@ skipping 24 matching lines @@
   __ csel(TMP, temp, ZR, EQ);
   __ vinsw(result, 2, TMP);
 
   // __ CompareObject(v3, Bool::True(), PP);
   __ CompareRegisters(v3, TMP2);
   __ csel(TMP, temp, ZR, EQ);
   __ vinsw(result, 3, TMP);
 }
 
 
-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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void Int32x4GetFlagInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister value = locs()->in(0).fpu_reg();
   const Register result = locs()->out(0).reg();
 
@@ skipping 13 matching lines @@
     default: UNREACHABLE();
   }
 
   __ tst(result, Operand(result));
   __ LoadObject(result, Bool::True(), PP);
   __ LoadObject(TMP, Bool::False(), PP);
   __ csel(result, TMP, result, EQ);
 }
 
 
-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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      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::RequiresFpuRegister());
   return summary;
 }
 
 
 void Int32x4SelectInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister mask = locs()->in(0).fpu_reg();
   const VRegister trueValue = locs()->in(1).fpu_reg();
   const VRegister falseValue = locs()->in(2).fpu_reg();
   const VRegister out = locs()->out(0).fpu_reg();
   const VRegister temp = locs()->temp(0).fpu_reg();
 
   // Copy mask.
   __ vmov(temp, mask);
   // Invert it.
   __ vnot(temp, temp);
   // mask = mask & trueValue.
   __ vand(mask, mask, trueValue);
   // temp = temp & falseValue.
   __ vand(temp, temp, falseValue);
   // out = mask | temp.
   __ vorr(out, 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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Int32x4SetFlagInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister mask = locs()->in(0).fpu_reg();
   const Register flag = locs()->in(1).reg();
@@ skipping 17 matching lines @@
       __ vinsw(result, 2, TMP);
       break;
     case MethodRecognizer::kInt32x4WithFlagW:
       __ vinsw(result, 3, TMP);
       break;
     default: UNREACHABLE();
   }
 }
 
 
-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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Int32x4ToFloat32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister value = locs()->in(0).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
 
   if (value != result) {
     __ vmov(result, value);
   }
 }
 
 
-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 LocationSummary(
-      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void BinaryInt32x4OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister left = locs()->in(0).fpu_reg();
   const VRegister right = locs()->in(1).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
   switch (op_kind()) {
     case Token::kBIT_AND: __ vand(result, left, right); break;
     case Token::kBIT_OR: __ vorr(result, left, right); break;
     case Token::kBIT_XOR: __ veor(result, left, right); break;
     case Token::kADD: __ vaddw(result, left, right); break;
     case Token::kSUB: __ vsubw(result, 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 = 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::FpuRegisterLocation(V0));
     summary->set_out(0, Location::FpuRegisterLocation(V0));
     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());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void MathUnaryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (kind() == MathUnaryInstr::kSqrt) {
     const VRegister val = locs()->in(0).fpu_reg();
     const VRegister result = locs()->out(0).fpu_reg();
     __ fsqrtd(result, val);
   } else if (kind() == MathUnaryInstr::kDoubleSquare) {
     const VRegister val = locs()->in(0).fpu_reg();
     const VRegister result = locs()->out(0).fpu_reg();
     __ fmuld(result, val, val);
   } else {
     ASSERT((kind() == MathUnaryInstr::kSin) ||
            (kind() == MathUnaryInstr::kCos));
     __ CallRuntime(TargetFunction(), InputCount());
   }
 }
 
 
 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(R0));
   summary->set_in(1, Location::RegisterLocation(R1));
   summary->set_in(2, Location::RegisterLocation(R2));
   summary->set_in(3, Location::RegisterLocation(R3));
   summary->set_out(0, Location::RegisterLocation(R0));
   return summary;
 }
 
 
 void CaseInsensitiveCompareUC16Instr::EmitNativeCode(
     FlowGraphCompiler* compiler) {
 
   // Call the function.
   __ CallRuntime(TargetFunction(), TargetFunction().argument_count());
 }
 
 
-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 = 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());
     // Reuse the left register so that code can be made shorter.
     summary->set_out(0, Location::SameAsFirstInput());
     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 48 matching lines @@
   __ CompareRegisters(left, right);
   ASSERT(result == left);
   if (is_min) {
     __ csel(result, right, left, GT);
   } else {
     __ csel(result, right, left, LT);
   }
 }
 
 
-LocationSummary* UnarySmiOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnarySmiOpInstr::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());
   // We make use of 3-operand instructions by not requiring result register
   // to be identical to first input register as on Intel.
   summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void UnarySmiOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register value = locs()->in(0).reg();
@@ skipping 12 matching lines @@
       __ mvn(result, value);
       // Remove inverted smi-tag.
       __ andi(result, result, Immediate(~kSmiTagMask));
       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::RequiresFpuRegister());
   return summary;
 }
 
 
 void UnaryDoubleOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister result = locs()->out(0).fpu_reg();
   const VRegister value = locs()->in(0).fpu_reg();
   __ fnegd(result, 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) {
   const Register value = locs()->in(0).reg();
   const VRegister result = locs()->out(0).fpu_reg();
   __ scvtfdw(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::RequiresRegister());
   result->set_out(0, Location::RequiresFpuRegister());
   return result;
 }
 
 
 void SmiToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register value = locs()->in(0).reg();
   const VRegister result = locs()->out(0).fpu_reg();
   __ SmiUntag(TMP, value);
   __ scvtfdx(result, TMP);
 }
 
 
-LocationSummary* MintToDoubleInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* MintToDoubleInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   UNIMPLEMENTED();
   return NULL;
 }
 
 
 void MintToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 
-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(R1));
   result->set_out(0, Location::RegisterLocation(R0));
   return result;
 }
 
 
 void DoubleToIntegerInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register result = locs()->out(0).reg();
   const Register value_obj = locs()->in(0).reg();
   ASSERT(result == R0);
@@ skipping 29 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);
   const Register result = locs()->out(0).reg();
   const VRegister value = locs()->in(0).fpu_reg();
   // First check for NaN. Checking for minint after the conversion doesn't work
   // on ARM64 because fcvtzds gives 0 for NaN.
   // TODO(zra): Check spec that this is true.
   __ fcmpd(value, value);
   __ b(deopt, VS);
 
   __ fcvtzds(result, value);
   // Check for overflow and that it fits into Smi.
   __ CompareImmediate(result, 0xC000000000000000, PP);
   __ b(deopt, MI);
   __ SmiTag(result);
   if (FLAG_throw_on_javascript_int_overflow) {
     EmitJavascriptOverflowCheck(compiler, range(), deopt, result);
   }
 }
 
 
-LocationSummary* DoubleToDoubleInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* DoubleToDoubleInstr::MakeLocationSummary(Zone* zone,
                                                           bool opt) const {
   UNIMPLEMENTED();
   return NULL;
 }
 
 
 void DoubleToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 
-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::RequiresFpuRegister());
   return result;
 }
 
 
 void DoubleToFloatInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister value = locs()->in(0).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
   __ fcvtsd(result, value);
 }
 
 
-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::RequiresFpuRegister());
   return result;
 }
 
 
 void FloatToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const VRegister value = locs()->in(0).fpu_reg();
   const VRegister result = locs()->out(0).fpu_reg();
   __ fcvtds(result, value);
 }
 
 
-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) ? 1 : 0;
-  LocationSummary* result = new(isolate) LocationSummary(
-      isolate, InputCount(), kNumTemps, LocationSummary::kCall);
+  LocationSummary* result = new(zone) LocationSummary(
+      zone, InputCount(), kNumTemps, LocationSummary::kCall);
   result->set_in(0, Location::FpuRegisterLocation(V0));
   if (InputCount() == 2) {
     result->set_in(1, Location::FpuRegisterLocation(V1));
   }
   if (recognized_kind() == MethodRecognizer::kMathDoublePow) {
     result->set_temp(0, Location::FpuRegisterLocation(V30));
   }
   result->set_out(0, Location::FpuRegisterLocation(V0));
   return result;
 }
@@ skipping 114 matching lines @@
 
 void InvokeMathCFunctionInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (recognized_kind() == MethodRecognizer::kMathDoublePow) {
     InvokeDoublePow(compiler, this);
     return;
   }
   __ CallRuntime(TargetFunction(), InputCount());
 }
 
 
-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 @@
     __ fmovdd(out, in);
   } else {
     ASSERT(representation() == kTagged);
     const Register out = locs()->out(0).reg();
     const Register in = in_loc.reg();
     __ mov(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);
     summary->set_in(0, Location::RequiresRegister());
     summary->set_in(1, Location::RequiresRegister());
     // Output is a pair of registers.
     summary->set_out(0, Location::Pair(Location::RequiresRegister(),
                                        Location::RequiresRegister()));
     return summary;
   }
   UNIMPLEMENTED();
   return NULL;
 }
@@ skipping 55 matching lines @@
     return;
   }
   if (kind() == MergedMathInstr::kSinCos) {
     UNIMPLEMENTED();
   }
   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 @@
                             R2,  // 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 50 matching lines @@
         __ b(deopt, NE);
       } else {
         __ b(&is_ok, EQ);
       }
     }
   }
   __ Bind(&is_ok);
 }
 
 
-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);
   __ CompareImmediate(value, Smi::RawValue(cid_), PP);
   __ b(deopt, NE);
 }
 
 
-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) {
   const Register value = locs()->in(0).reg();
   Label* deopt = compiler->AddDeoptStub(deopt_id(),
                                         ICData::kDeoptCheckSmi,
                                         licm_hoisted_ ? ICData::kHoisted : 0);
   __ tsti(value, Immediate(kSmiTagMask));
   __ b(deopt, NE);
 }
 
 
-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);
   locs->set_in(kLengthPos, Location::RegisterOrSmiConstant(length()));
   locs->set_in(kIndexPos, Location::RegisterOrSmiConstant(index()));
   return locs;
 }
 
 
 void CheckArrayBoundInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   uint32_t flags = generalized_ ? ICData::kGeneralized : 0;
   flags |= licm_hoisted_ ? ICData::kHoisted : 0;
   Label* deopt = compiler->AddDeoptStub(
@@ skipping 38 matching lines @@
     }
   } else {
     const Register length = length_loc.reg();
     const Register index = index_loc.reg();
     __ CompareRegisters(index, length);
     __ b(deopt, CS);
   }
 }
 
 
-LocationSummary* BinaryMintOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* BinaryMintOpInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   UNIMPLEMENTED();
   return NULL;
 }
 
 
 void BinaryMintOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 
 bool ShiftMintOpInstr::has_shift_count_check() const {
   UNREACHABLE();
   return false;
 }
 
 
-LocationSummary* ShiftMintOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* ShiftMintOpInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   UNIMPLEMENTED();
   return NULL;
 }
 
 
 void ShiftMintOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 
-LocationSummary* UnaryMintOpInstr::MakeLocationSummary(Isolate* isolate,
+LocationSummary* UnaryMintOpInstr::MakeLocationSummary(Zone* zone,
                                                        bool opt) const {
   UNIMPLEMENTED();
   return NULL;
 }
 
 
 void UnaryMintOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
@@ skipping 12 matching lines @@
   return CompileType::FromCid(kSmiCid);
 }
 
 
 DEFINE_UNIMPLEMENTED_INSTRUCTION(BinaryUint32OpInstr)
 DEFINE_UNIMPLEMENTED_INSTRUCTION(ShiftUint32OpInstr)
 DEFINE_UNIMPLEMENTED_INSTRUCTION(UnaryUint32OpInstr)
 DEFINE_UNIMPLEMENTED_INSTRUCTION(BinaryInt32OpInstr)
 
 
-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() == kUnboxedMint) {
     UNREACHABLE();
   } else if (to() == kUnboxedMint) {
     UNREACHABLE();
   } else {
     ASSERT((to() == kUnboxedUint32) || (to() == kUnboxedInt32));
     ASSERT((from() == kUnboxedUint32) || (from() == kUnboxedInt32));
     summary->set_in(0, Location::RequiresRegister());
     summary->set_out(0, Location::RequiresRegister());
   }
@@ skipping 31 matching lines @@
     UNREACHABLE();
   } else if (to() == kUnboxedMint) {
     ASSERT((from() == kUnboxedUint32) || (from() == kUnboxedInt32));
     UNREACHABLE();
   } 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());
   __ brk(0);
 }
 
 
-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());
   __ brk(0);
 }
 
 
 void GraphEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (!compiler->CanFallThroughTo(normal_entry())) {
     __ b(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.  On ARM64 this descriptor
     // points after the edge counter code so that we can reuse the same
     // pattern matching code as at call sites, which 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())) {
     __ b(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.
   __ ldr(target_address_reg, Address(FP, kPcMarkerSlotFromFp * kWordSize));
 
   // Add the offset.
   Register offset_reg = locs()->in(0).reg();
   Operand offset_opr =
       (offset()->definition()->representation() == kTagged) ?
       Operand(offset_reg, ASR, kSmiTagSize) :
       Operand(offset_reg);
   __ add(target_address_reg, target_address_reg, offset_opr);
 
   // Jump to the absolute address.
   __ br(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(R0));
     locs->set_in(1, Location::RegisterLocation(R1));
     locs->set_out(0, Location::RegisterLocation(R0));
     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 51 matching lines @@
 void StrictCompareInstr::EmitBranchCode(FlowGraphCompiler* compiler,
                                         BranchInstr* branch) {
   ASSERT(kind() == Token::kEQ_STRICT || kind() == Token::kNE_STRICT);
 
   BranchLabels labels = compiler->CreateBranchLabels(branch);
   Condition true_condition = EmitComparisonCode(compiler, labels);
   EmitBranchOnCondition(compiler, true_condition, labels);
 }
 
 
-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) {
   const Register value = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
 
   __ LoadObject(result, Bool::True(), PP);
   __ LoadObject(TMP, Bool::False(), PP);
   __ CompareRegisters(result, value);
   __ csel(result, TMP, result, EQ);
 }
 
 
-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 12 matching lines @@
   compiler->GenerateCall(token_pos(), &label, stub_kind_, locs());
 #if defined(DEBUG)
   __ LoadImmediate(R4, kInvalidObjectPointer, kNoPP);
   __ LoadImmediate(R5, kInvalidObjectPointer, kNoPP);
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64