[PATCH] [NaryReassociate] Run EarlyCSE/GVN after NaryReassociate

[Jingyue Wu]

Hi broune, meheff,

This patch made two improvements to NaryReassociate and the NVPTX pipeline

1. Run EarlyCSE/GVN after NaryReassociate to get rid of redundant common
expressions.

2. When adding an instruction to SeenExprs, maps both the SCEV before and after
reassociation to that instruction.

http://reviews.llvm.org/D9947

Files:
  lib/Target/NVPTX/NVPTXTargetMachine.cpp
  lib/Transforms/Scalar/NaryReassociate.cpp
  test/Transforms/NaryReassociate/NVPTX/nary-gep.ll

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