[stubs] Optimize LoadGlobalViaContextStub and StoreGlobalViaContextStub.

src/ia32/macro-assembler-ia32.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_IA32_MACRO_ASSEMBLER_IA32_H_
 #define V8_IA32_MACRO_ASSEMBLER_IA32_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 1050 matching lines @@
   int offset = FixedArray::kHeaderSize + additional_offset * kPointerSize;
   return FieldOperand(array, index_as_smi, times_half_pointer_size, offset);
 }
 
 
 inline Operand ContextOperand(Register context, int index) {
   return Operand(context, Context::SlotOffset(index));
 }
 
 
+inline Operand ContextOperand(Register context, Register index) {
+  return Operand(context, index, times_pointer_size, Context::SlotOffset(0));
+}
+
+
 inline Operand GlobalObjectOperand() {
   return ContextOperand(esi, Context::GLOBAL_OBJECT_INDEX);
 }
 
 
 #ifdef GENERATED_CODE_COVERAGE
 extern void LogGeneratedCodeCoverage(const char* file_line);
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
@@ skipping 10 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_MACRO_ASSEMBLER_IA32_H_