Fix accessor lookup in crankshaft.

test/mjsunit/object-define-property.js

 // Copyright 2012 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 1154 matching lines @@
                       { get: getter, set: undefined, configurable: true });
 
 exception = false;
 try {
   testSetterOnProtoStrict(obj3);
 } catch (e) {
   exception = true;
   assertTrue(/which has only a getter/.test(e));
 }
 assertTrue(exception);
+
+// Test assignment to a getter-only property on the prototype chain.

[Michael Starzinger, 2012/08/16 09:55:58]

Can we extend this comment to say that it actually tests that Crankshaft doesn't
solely rely on type-feedback but rechecks assumptions.

[Sven Panne, 2012/08/16 10:47:40]

Done.

+
+function Assign(o) {
+  o.blubb = 123;
+}
+
+function C() {}
+
+Assign(new C);
+Assign(new C);
+%OptimizeFunctionOnNextCall(Assign);
+Object.defineProperty(C.prototype, "blubb", {get: function() { return -42; }});
+Assign(new C);