[PATCH] Fix SROA creating invalid bitcasts between address spaces

[Matt Arsenault]

  Merge in other SROA address patches I had lying around, add another testcase.

Hi chandlerc,

http://llvm-reviews.chandlerc.com/D1764

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1764?vs=4494&id=5964#toc

Files:
  lib/Transforms/Scalar/SROA.cpp
  test/Transforms/SROA/address-spaces.ll
  test/Transforms/SROA/alignment.ll
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