[PATCH] [NVPTX] Replace addrspacecast with bitcast

[Jingyue Wu]

Hi jholewinski, arsenm, eliben,

Fixed a TODO item in r205571.
    
To eliminate an addrspacecast that changes the underlying element type,
we replace it with a bitcast instead of removing it completely.
    
Updated the comments to make them consistent with the new code.
    
Added a test and modified one old test for this change.

http://reviews.llvm.org/D3586

Files:
  lib/Target/NVPTX/NVPTXFavorNonGenericAddrSpaces.cpp
  test/CodeGen/NVPTX/access-non-generic.ll
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