Merge r5476 into 2.3 branch (issue3434004).

test/mjsunit/this-property-assignment.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
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 21 matching lines @@
   this.a = 1;
   this.a = 2;
   this.a = 3;
 }
 
 var n1 = new Node();
 assertEquals(3, n1.a);
 
 var n2 = new Node();
 assertEquals(3, n2.a);