[PATCH] Teach LoopIdiom about address spaces

[Matt Arsenault]

  Move address space check for memset_pattern16


  Most of the address space tests are copies of other tests. They aren't supposed to do much different other than use the different integer sizes and preserve the address spaces.

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1462?vs=3780&id=4183#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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