Merge up to 8597 to experimental/gc from the bleeding edge.

test/mjsunit/regress/regress-88858.js

 // Copyright 2011 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 45 matching lines @@
            return NaN;
        return __construct__;
     }
     f.p = function() { };
     Object.freeze(p);
     new new freeze().p;
     reportCompare(0, 0, "ok");
 } catch(exc2) { }
 
 gc();