[PATCH] Add NVPTXPeephole pass to reduce unnecessary address cast

[Xuetian Weng]

add a new test case to test a case of not emitting cvta.local %SP, %SPL


http://reviews.llvm.org/D10549

Files:
  lib/Target/NVPTX/CMakeLists.txt
  lib/Target/NVPTX/NVPTX.h
  lib/Target/NVPTX/NVPTXFrameLowering.cpp
  lib/Target/NVPTX/NVPTXPeephole.cpp
  lib/Target/NVPTX/NVPTXRegisterInfo.td
  lib/Target/NVPTX/NVPTXTargetMachine.cpp
  test/CodeGen/NVPTX/call-with-alloca-buffer.ll
  test/CodeGen/NVPTX/local-stack-frame.ll

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