Merge 6168:6800 from bleeding_edge to experimental/gc branch.

test/mjsunit/regress/regress-1130.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 18 matching lines @@
 // of JS accessors on Object's prototype elements.
 
 Object.prototype.__defineGetter__(0, function() { throw 42; } );
 
 try {
   eval("(function() { const x; var x })")();
   assertUnreachable();
 } catch (e) {
   assertTrue(e instanceof TypeError);
 }