[PATCH] Removing unnecessary addrspacecasts from non-generic address spaces to the generic address space

[Jingyue Wu]

  All comments addressed. PTAL

Hi eliben, jholewinski,

http://llvm-reviews.chandlerc.com/D3235

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D3235?vs=8244&id=8248#toc

Files:
  lib/Target/NVPTX/CMakeLists.txt
  lib/Target/NVPTX/NVPTX.h
  lib/Target/NVPTX/NVPTXFavorNonGenericAddrSpaces.cpp
  lib/Target/NVPTX/NVPTXTargetMachine.cpp
  test/CodeGen/NVPTX/access-non-generic.ll
  test/CodeGen/NVPTX/addrspacecast.ll
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