Merge 6006:6095 from bleeding_edge to experimental/gc branch.

test/mjsunit/with-readonly.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 23 matching lines @@
 
 function f() {
   with (o) {
     length = 23;
     length = 24;
     assertEquals(24, length);
   }
 }
 f();