When the TypeRecordingBinaryOpStub expect smi values as input, they might
sometimes come as HeapNumbers. The transition code will detect the heap numbers
as holding values that are valid smi values, and will not change the expectations.
However, the stub didn't handle HeapNumbers and always tried to transition again.

Review URL: http://codereview.chromium.org/6812046

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7560 ce2b1a6d-e550-0410-aec6-3dcde31c8c00