Only use the non-strict-arguments-stub if the store site is non-strict.

BUG=349874
LOG=N
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/176843018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19690 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ic.cc

@@ -1689,7 +1689,9 @@ MaybeObject* KeyedStoreIC::Store(Handle<Object> object,
         bool key_is_smi_like = key->IsSmi() || !key->ToSmi()->IsFailure();
         if (receiver->elements()->map() ==
             isolate()->heap()->non_strict_arguments_elements_map()) {
-          stub = non_strict_arguments_stub();
+          if (strict_mode() == kNonStrictMode) {
+            stub = non_strict_arguments_stub();
+          }
         } else if (key_is_smi_like &&
                    !(target().is_identical_to(non_strict_arguments_stub()))) {
           // We should go generic if receiver isn't a dictionary, but our

test/mjsunit/regress-keyed-store-non-strict-arguments.js

+// 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.
+
+function args(arg) { return arguments; }
+var a = args(false);
+
+(function () {
+  "use strict";
+  a["const" + 0] = 0;
+})();
+
+(function () {
+  "use strict";
+  a[0] = 0;
+})();