Avoid HeapObject check in HStoreNamedField.

src/x64/lithium-x64.cc

 // Copyright 2012 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 "v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "lithium-allocator-inl.h"
 #include "x64/lithium-x64.h"
@@ skipping 2309 matching lines @@
     val = UseRegisterAtStart(instr->value());
   } else {
     val = UseRegister(instr->value());
   }
 
   // We only need a scratch register if we have a write barrier or we
   // have a store into the properties array (not in-object-property).
   LOperand* temp = (!is_in_object || needs_write_barrier ||
       needs_write_barrier_for_map) ? TempRegister() : NULL;
 
-  LInstruction* result = new(zone()) LStoreNamedField(obj, val, temp);
-  if (!instr->access().IsExternalMemory() &&
-      instr->field_representation().IsHeapObject() &&
-      (val->IsConstantOperand()
-       ? HConstant::cast(instr->value())->HasSmiValue()
-       : !instr->value()->type().IsHeapObject())) {
-    result = AssignEnvironment(result);
-  }
-  return result;
+  return new(zone()) LStoreNamedField(obj, val, temp);
 }
 
 
 LInstruction* LChunkBuilder::DoStoreNamedGeneric(HStoreNamedGeneric* instr) {
   LOperand* context = UseFixed(instr->context(), rsi);
   LOperand* object = UseFixed(instr->object(), rdx);
   LOperand* value = UseFixed(instr->value(), rax);
 
   LStoreNamedGeneric* result =
       new(zone()) LStoreNamedGeneric(context, object, value);
@@ skipping 252 matching lines @@
   LOperand* index = UseTempRegister(instr->index());
   LLoadFieldByIndex* load = new(zone()) LLoadFieldByIndex(object, index);
   LInstruction* result = DefineSameAsFirst(load);
   return AssignPointerMap(result);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64