[Isolates] Merge crankshaft (r5922 from bleeding_edge).

test/mjsunit/compiler/assignment.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 246 matching lines @@
     b.foo = 5;
     b.foo += 12;
 
     assertEquals(17, b.foo);
   }
 }
 
 bar_loop();
 
 
+// Test assignment in test context.
+function test_assign(x, y) { if (x = y) return x; }
+
+assertEquals(42, test_assign(0, 42));
+
+assertEquals("undefined", typeof test_assign(42, 0));
+
 // Test for assignment using a keyed store ic:
 function store_i_in_element_i_of_object_i() {
   var i = new Object();
   i[i] = i;
 }
 
 // Run three times to exercise caches.
 store_i_in_element_i_of_object_i();
 store_i_in_element_i_of_object_i();
 store_i_in_element_i_of_object_i();