New hydrogen instruction to reduce cost of growing an array on keyed stores.

src/interface-descriptors.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 "src/v8.h"
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 131 matching lines @@
 
 
 void ContextOnlyDescriptor::Initialize(CallInterfaceDescriptorData* data) {
   Register registers[] = {ContextRegister()};
   data->Initialize(arraysize(registers), registers, NULL);
 }
 
 
 void GrowArrayElementsDescriptor::Initialize(
     CallInterfaceDescriptorData* data) {
-  Register registers[] = {ContextRegister(), ObjectRegister(), KeyRegister(),
-                          CapacityRegister()};
+  Register registers[] = {ContextRegister(), ObjectRegister(), KeyRegister()};
   data->Initialize(arraysize(registers), registers, NULL);
 }
 }
 }  // namespace v8::internal