[PATCH] Fix SROA creating invalid bitcasts between address spaces

[Rafael Espíndola]

> Sorry. In phab it looked like a new file when I first looked at it.

OK, I tried to take a quick look, but there is no way that I can get
enough confidence on how SROA works in a short time.

In the end I just extracted a trivial cleanup from this patch
(r201425) and rebased it on trunk (attached).

I also checked that every use of an address space in the patch is tested.

Cheers,
Rafael
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