[PATCH] [NVPTX] kernel pointer arguments point to the global address space

[Jingyue Wu]

Hi eliben, jholewinski, meheff,

With this patch, NVPTXLowerKernelArgs converts a kernel pointer argument to a
pointer in the global address space. This change, along with
NVPTXFavorNonGenericAddrSpaces, allows the NVPTX backend to emit ld.global.*
and st.global.* for accessing kernel pointer arguments.

Minor changes:
1. refactor: extract function convertToPointerInAddrSpace
2. fix a bug in the test case in bug21465.ll

http://reviews.llvm.org/D10154

Files:
  lib/Target/NVPTX/CMakeLists.txt
  lib/Target/NVPTX/NVPTX.h
  lib/Target/NVPTX/NVPTXLowerKernelArgs.cpp
  lib/Target/NVPTX/NVPTXLowerStructArgs.cpp
  lib/Target/NVPTX/NVPTXTargetMachine.cpp
  test/CodeGen/NVPTX/bug21465.ll
  test/CodeGen/NVPTX/lower-kernel-ptr-arg.ll

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