Push version 2.5.7 to trunk....

test/mjsunit/regress/regress-931.js

 // Copyright 2009 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 28 matching lines @@
 
 var result = (first()[second()](third(), fourth()))
 assertEquals(7, result);
 assertEquals("1234", sequence);
 
 function second_prime() { sequence += "2'"; return 2; }
 
 var result = (first()[second_prime()](third(), fourth()))
 assertEquals(-1, result);
 assertEquals("123412'34", sequence);