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

test/cctest/compiler/codegen-tester.h

Index: test/cctest/compiler/codegen-tester.h
diff --git a/test/cctest/compiler/codegen-tester.h b/test/cctest/compiler/codegen-tester.h
index e12026b031ae26a0d2ba3fc5eeabf8f47718c270..21227aa0176bdcff8dce86d0b860064693bc3bfa 100644
--- a/test/cctest/compiler/codegen-tester.h
+++ b/test/cctest/compiler/codegen-tester.h
@@ -110,7 +110,8 @@ class BinopTester {
 
   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);