[PATCH] CSE on GEP indices

[Jingyue Wu]

Hi hfinkel, eliben, jholewinski,

Add an optimization that eliminates common sub-expressions in a group of similar GEPs.

TEST PLAN
  Added two tests in test/Transforms/SeparateConstOffsetFromGEP/NVPTX. Run them with "make -C test".

BRANCH
  gep

http://reviews.llvm.org/D3462

Files:
  include/llvm/InitializePasses.h
  include/llvm/LinkAllPasses.h
  include/llvm/Transforms/Scalar.h
  lib/Target/NVPTX/NVPTXTargetMachine.cpp
  lib/Transforms/Scalar/Scalar.cpp
  lib/Transforms/Scalar/SeparateConstOffsetFromGEP.cpp
  test/Transforms/SeparateConstantOffsetFromGEP/NVPTX/gvn-pre.ll
  test/Transforms/SeparateConstantOffsetFromGEP/NVPTX/lit.local.cfg
  test/Transforms/SeparateConstantOffsetFromGEP/NVPTX/split-gep.ll

REPLY HANDLER ACTIONS
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