[PATCH] [NVPTX] fix a crash bug in NVPTXFavorNonGenericAddrSpaces

[Jingyue Wu]

Hi broune, jholewinski,

We used to assume V->RAUW only modifies the operand list of V's user.
However, if V and V's user are Constants, RAUW may replace and invalidate V's
user entirely.

This patch fixes the above issue by letting the caller replace the
operand instead of calling RAUW on Constants.

http://reviews.llvm.org/D10345

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

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