[Interpreter] Add support for loading from / storing to outer context variables.

test/cctest/compiler/codegen-tester.h

 // Copyright 2014 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_CCTEST_COMPILER_CODEGEN_TESTER_H_
 #define V8_CCTEST_COMPILER_CODEGEN_TESTER_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/instruction-selector.h"
@@ skipping 92 matching lines @@
     if (use_result_buffer) {
       CHECK_EQ(CHECK_VALUE, T->Call());
       return result;
     } else {
       return static_cast<CType>(T->Call());
     }
   }
 
   void AddReturn(Node* val) {
     if (use_result_buffer) {
-      T->Store(rep, T->PointerConstant(&result), T->Int32Constant(0), val);
+      T->Store(StoreRepresentation(rep, kNoWriteBarrier),
+               T->PointerConstant(&result), T->Int32Constant(0), val);
       T->Return(T->Int32Constant(CHECK_VALUE));
     } else {
       T->Return(val);
     }
   }
 
   template <typename Ci, typename Cj, typename Fn>
   void Run(const Ci& ci, const Cj& cj, const Fn& fn) {
     typename Ci::const_iterator i;
     typename Cj::const_iterator j;
@@ skipping 196 matching lines @@
   } else {
     CHECK_EQ(x, y);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CCTEST_COMPILER_CODEGEN_TESTER_H_