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

test/mjsunit/regress/regress-crbug-87478.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 16 matching lines @@
 
 // Check that arguments access ICs correctly handle non-JSObject
 // receivers.
 function f(array) { return array[0]; }
 function args(a) { return arguments; }
 // Put the keyed load in f into the keyed-load-arguments state.
 for (var i = 0; i < 10; i++) {
   f(args(1));
 }
 f('123');