Fix bug in Object.defineProperty where a growing lements dictionary was ignored.

test/mjsunit/object-define-property.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
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@@ skipping 1027 matching lines @@
   { enumerable : false, configurable : false },
   { get: getter1, set: setter1, enumerable : false, configurable : false });
 
 // redefine of set only property with generic descriptor
 o = {};
 Object.defineProperty(o, 'p',
   { set : setter1, enumerable: true, configurable: true });
 testDefineProperty(o, 'p',
   { enumerable : false, configurable : false },
   { get: undefined, set: setter1, enumerable : false, configurable : false });
+
+
+// Regression test: Ensure that growing dictionaries are not ignored.
+o = {};
+for (var i = 0; i < 1000; i++) {
+  // Non-enumerable property forces dictionary mode.
+  Object.defineProperty(o, i, {value: i, enumerable: false});
+}
+assertEquals(999, o[999]);