Avoid HeapObject check in HStoreNamedField.

src/hydrogen-instructions.h

 // 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.
 
 #ifndef V8_HYDROGEN_INSTRUCTIONS_H_
 #define V8_HYDROGEN_INSTRUCTIONS_H_
 
 #include "v8.h"
 
 #include "allocation.h"
@@ skipping 6798 matching lines @@
     return StoringValueNeedsWriteBarrier(value()) &&
         ReceiverObjectNeedsWriteBarrier(object(), value(),
                                         new_space_dominator());
   }
 
   bool NeedsWriteBarrierForMap() {
     return ReceiverObjectNeedsWriteBarrier(object(), transition(),
                                            new_space_dominator());
   }
 
+  SmiCheck SmiCheckForWriteBarrier() const {
+    if (field_representation().IsHeapObject()) return OMIT_SMI_CHECK;
+    if (value()->IsHeapObject()) return OMIT_SMI_CHECK;
+    return INLINE_SMI_CHECK;
+  }
+
   Representation field_representation() const {
     return access_.representation();
   }
 
   void UpdateValue(HValue* value) {
     SetOperandAt(1, value);
   }
 
   bool CanBeReplacedWith(HStoreNamedField* that) const {
     if (!this->access().Equals(that->access())) return false;
@@ skipping 974 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_