[crankshaft] Remove dead Variable hole-checking code

src/crankshaft/arm64/lithium-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/arm64/lithium-arm64.h"
 
 #include <sstream>
 
 #include "src/crankshaft/arm64/lithium-codegen-arm64.h"
 #include "src/crankshaft/hydrogen-osr.h"
@@ skipping 1489 matching lines @@
   HEnvironment* outer =
       current_block_->last_environment()->DiscardInlined(false);
   current_block_->UpdateEnvironment(outer);
 
   return pop;
 }
 
 
 LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
   LOperand* context = UseRegisterAtStart(instr->value());
-  LInstruction* result =
-      DefineAsRegister(new(zone()) LLoadContextSlot(context));
-  if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
-    result = AssignEnvironment(result);
-  }
-  return result;
+  return DefineAsRegister(new (zone()) LLoadContextSlot(context));
 }
 
 
 LInstruction* LChunkBuilder::DoLoadFunctionPrototype(
     HLoadFunctionPrototype* instr) {
   LOperand* function = UseRegister(instr->function());
   LOperand* temp = TempRegister();
   return AssignEnvironment(DefineAsRegister(
       new(zone()) LLoadFunctionPrototype(function, temp)));
 }
@@ skipping 565 matching lines @@
   LOperand* value;
   if (instr->NeedsWriteBarrier()) {
     // TODO(all): Replace these constraints when RecordWriteStub has been
     // rewritten.
     context = UseRegisterAndClobber(instr->context());
     value = UseRegisterAndClobber(instr->value());
   } else {
     context = UseRegister(instr->context());
     value = UseRegister(instr->value());
   }
-  LInstruction* result = new(zone()) LStoreContextSlot(context, value, temp);
-  if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
-    result = AssignEnvironment(result);
-  }
-  return result;
+  return new (zone()) LStoreContextSlot(context, value, temp);
 }
 
 
 LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
   LOperand* key = UseRegisterOrConstant(instr->key());
   LOperand* temp = NULL;
   LOperand* elements = NULL;
   LOperand* val = NULL;
 
   if (!instr->is_fixed_typed_array() &&
@@ skipping 373 matching lines @@
 
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegister(instr->function());
   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function);
   return AssignEnvironment(DefineAsRegister(result));
 }
 
 }  // namespace internal
 }  // namespace v8