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

src/arm/interface-descriptors-arm.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"
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/interface-descriptors.h"
 
@@ skipping 38 matching lines @@
 const Register MathPowTaggedDescriptor::exponent() { return r2; }
 
 
 const Register MathPowIntegerDescriptor::exponent() {
   return MathPowTaggedDescriptor::exponent();
 }
 
 
 const Register GrowArrayElementsDescriptor::ObjectRegister() { return r0; }
 const Register GrowArrayElementsDescriptor::KeyRegister() { return r3; }
-const Register GrowArrayElementsDescriptor::CapacityRegister() { return r2; }
 
 
 void FastNewClosureDescriptor::Initialize(CallInterfaceDescriptorData* data) {
   Register registers[] = {cp, r2};
   data->Initialize(arraysize(registers), registers, NULL);
 }
 
 
 void FastNewContextDescriptor::Initialize(CallInterfaceDescriptorData* data) {
   Register registers[] = {cp, r1};
@@ skipping 335 matching lines @@
       Representation::Tagged(),  //
       Representation::Tagged(),  //
       Representation::Tagged(),  //
   };
   data->Initialize(arraysize(registers), registers, representations);
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM