Experimental parser: merge to r19637

test/mjsunit/harmony/regress/regress-2156.js

 // Copyright 2012 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
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 19 matching lines @@
 var key1 = {};
 var key2 = {};
 var map = new WeakMap;
 
 // Adding hidden properties preserves map sharing. Putting the key into
 // a WeakMap will cause the first hidden property to be added.
 assertTrue(%HaveSameMap(key1, key2));
 map.set(key1, 1);
 map.set(key2, 2);
 assertTrue(%HaveSameMap(key1, key2));