[Isolates] Merge crankshaft (r5922 from bleeding_edge).

test/mjsunit/smi-ops.js

Index: test/mjsunit/smi-ops.js
diff --git a/test/mjsunit/smi-ops.js b/test/mjsunit/smi-ops.js
index 8fa6fec60a2d2c889784f446dd7bc0c39f2a27b2..7945855f39c1f8b6181ce48e5fa4091084c3182d 100644
--- a/test/mjsunit/smi-ops.js
+++ b/test/mjsunit/smi-ops.js
@@ -699,3 +699,6 @@ assertEquals(24, LeftShiftThreeBy(-29));
 // 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);