[es6] Make sure we call add property when adding a new property

test/mjsunit/es6/regress/regress-cr493566.js

Index: test/mjsunit/es6/regress/regress-cr493566.js
diff --git a/test/mjsunit/compiler/regress-469089.js b/test/mjsunit/es6/regress/regress-cr493566.js
similarity index 58%
copy from test/mjsunit/compiler/regress-469089.js
copy to test/mjsunit/es6/regress/regress-cr493566.js
index 6aff2b720305290570124cec0dd7a4a959f05694..0ae6ab0f441ce2682673815bf5ceeb08940fdd37 100644
--- a/test/mjsunit/compiler/regress-469089.js
+++ b/test/mjsunit/es6/regress/regress-cr493566.js
@@ -1,16 +1,16 @@
 // Copyright 2015 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.
+"use strict";
 
-// Flags: --expose-gc
+var global = this;
 
 (function() {
-  var __v_6 = false;
-  function f(val, idx) {
-    if (idx === 1) {
-      gc();
-      __v_6 = (val === 0);
+  class A {
+    s() {
+      super.bla = 10;
     }
   }
-  f(.1, 1);
+  new A().s.call(global);
+  assertEquals(10, global.bla);
 })();