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

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

Index: test/mjsunit/regress-keyed-store-non-strict-arguments.js
diff --git a/test/mjsunit/regress/regress-347906.js b/test/mjsunit/regress-keyed-store-non-strict-arguments.js
similarity index 50%
copy from test/mjsunit/regress/regress-347906.js
copy to test/mjsunit/regress-keyed-store-non-strict-arguments.js
index c751618928c93015679087ee1b500637657aa341..865d600ad90f1b9c6915659d242e2122ba407008 100644
--- a/test/mjsunit/regress/regress-347906.js
+++ b/test/mjsunit/regress-keyed-store-non-strict-arguments.js
@@ -2,13 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --harmony
+function args(arg) { return arguments; }
+var a = args(false);
 
-function foo() {
-  return Math.clz32(12.34);
-}
+(function () {
+  "use strict";
+  a["const" + 0] = 0;
+})();
 
-foo();
-foo();
-%OptimizeFunctionOnNextCall(foo);
-foo();
+(function () {
+  "use strict";
+  a[0] = 0;
+})();