Use the same registers for StoreIC and KeyedStoreIC.

src/x64/ic-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 "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/codegen.h"
 #include "src/ic-inl.h"
@@ skipping 1047 matching lines @@
 const Register KeyedStoreIC::NameRegister() {
   return StoreIC::NameRegister();
 }
 
 
 const Register KeyedStoreIC::ValueRegister() {
   return StoreIC::ValueRegister();
 }
 
 
+const Register KeyedStoreIC::MapRegister() {
+  return rbx;
+}
+
+
 void KeyedLoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) {
   // The return address is on the stack.
 
   __ PopReturnAddressTo(KeyedLoadIC_TempRegister());
   __ Push(ReceiverRegister());  // receiver
   __ Push(NameRegister());  // name
   __ PushReturnAddressFrom(KeyedLoadIC_TempRegister());
 
   // Perform tail call to the entry.
   __ TailCallRuntime(Runtime::kKeyedGetProperty, 2, 1);
@@ skipping 194 matching lines @@
   Condition cc = (check == ENABLE_INLINED_SMI_CHECK)
       ? (*jmp_address == Assembler::kJncShortOpcode ? not_zero : zero)
       : (*jmp_address == Assembler::kJnzShortOpcode ? not_carry : carry);
   *jmp_address = static_cast<byte>(Assembler::kJccShortPrefix | cc);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64