[PATCH] Teach InstCombine about pointer address spaces

[Matt Arsenault]

  Split other parts, add a part I missed on the first pass (FindElementAtOffset)

  Doesn't do InstCombineCalls and a few other minor places which I'll get in another pass

http://llvm-reviews.chandlerc.com/D1250

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1250?vs=3116&id=3135#toc

Files:
  lib/Analysis/InstructionSimplify.cpp
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineCasts.cpp
  lib/Transforms/InstCombine/InstructionCombining.cpp
  test/Transforms/InstCombine/enforce-known-alignment.ll
  test/Transforms/InstCombine/getelementptr.ll
  test/Transforms/InstCombine/icmp.ll
  test/Transforms/InstCombine/multi-size-address-space-pointer.ll
  test/Transforms/InstCombine/sub.ll
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