This test checks that setting a non-object, non-null value for __proto__ does not lead to a crash when next setting a property on the object. This was reported as bug 17925.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS x.__proto__ is originalProto
If we got to this point then we did not crash and the test has passed.
PASS successfullyParsed is true
TEST COMPLETE