[PATCH] Add NVPTXLowerAlloca pass to convert alloca'ed memory to local address

[Xuetian Weng]

Hi jingyue, jholewinski,

This is done by first adding two additional instructions to convert the
alloca returned address to local and convert it back to generic. Then
replace all uses of alloca instruction with the converted generic
address. Then we can rely NVPTXFavorNonGenericAddrSpace pass to combine
the generic addresscast and the corresponding Load, Store, Bitcast, GEP
Instruction together.

http://reviews.llvm.org/D10483

Files:
  lib/Target/NVPTX/CMakeLists.txt
  lib/Target/NVPTX/NVPTX.h
  lib/Target/NVPTX/NVPTXLowerAlloca.cpp
  lib/Target/NVPTX/NVPTXTargetMachine.cpp
  test/CodeGen/NVPTX/call-with-alloca-buffer.ll
  test/CodeGen/NVPTX/lower-alloca.ll

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