[PATCH] Don't use runtime bounds check between different address space pointers

[Matt Arsenault]

Hi nadav,

Don't vectorize with a runtime check if it requires a comparison between pointers with different address spaces. The values can't be assumed to be directly comparable. Previously it would create an illegal bitcast.

http://llvm-reviews.chandlerc.com/D1804

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/runtime-check-address-space.ll
  test/Transforms/LoopVectorize/runtime-check-readonly-address-space.ll
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