ARM Cast Cost Table

[Renato Golin]

Hi Nadav,

This is an entry level change, just to make sure everything is in the right
place and the infrastructure is ready. The code change is trivial.

http://llvm-reviews.chandlerc.com/D345

I spent a bit more time on tests, to make sure the costs were correctly
taken and exposing the instruction I expect to do the cast clearly stated.

Both tests refer to the same source code, but one is vectorized and the
other is not. With time, we can fill them with cost checks for other
instructions, I just didn't do it because I wasn't sure they were correct
(some I know aren't).

cheers,
--renato
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