[PATCH] Teach LoopIdiom about address spaces

[Matt Arsenault]

  Don't use memset_pattern with nonzero address spaces.

  Which tests don't look useful? The second test in lftr-address-space-pointers.ll might be redundant

http://llvm-reviews.chandlerc.com/D1462

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1462?vs=3636&id=3780#toc

Files:
  lib/Transforms/Scalar/LoopIdiomRecognize.cpp
  test/Transforms/IndVarSimplify/lftr-address-space-pointers.ll
  test/Transforms/LoopIdiom/basic-address-space.ll
  test/Transforms/LoopStrengthReduce/addrec-gep-address-space.ll
  test/Transforms/LoopStrengthReduce/address-space-loop.ll
  test/Transforms/LoopStrengthReduce/uglygep-address-space.ll
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