[PATCH] Add NVPTXPeephole pass to reduce unnecessary address cast

[Xuetian Weng]

In http://reviews.llvm.org/D10549#193496, @jholewinski wrote:

> What is the future expectation for NVPTXPeephole?  Are you planning on adding additional transforms?  If not, perhaps a more specific name is warranted.  Otherwise, LGTM!  Thanks!


One thing currently in my mind is to combine some other unnecessary address cast just like this pass. I've noticed some other pointless address cast in generated code (e.g. the "FIXME" in call-with-alloca-buffer.ll).


http://reviews.llvm.org/D10549

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