[Isolates] Merge crankshaft (r5922 from bleeding_edge).

test/mjsunit/smi-ops.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 681 matching lines @@
 function LeftShiftThreeBy(x) {return 3 << x;}
 assertEquals(24, LeftShiftThreeBy(3));
 assertEquals(24, LeftShiftThreeBy(35));
 assertEquals(24, LeftShiftThreeBy(67));
 assertEquals(24, LeftShiftThreeBy(-29));
 
 // Regression test for a bug in the ARM code generator.  For some register
 // allocations we got the Smi overflow case wrong.
 function f(x, y) { return y +  ( 1 << (x & 31)); }
 assertEquals(-2147483647, f(31, 1));
+
+// Regression test for correct handling of overflow in smi comparison.
+assertTrue(-0x40000000 < 42);