[PATCH] Fixed several correctness issues on mishandling s/zext in SeparateConstOffsetFromGEP

[Jingyue Wu]

Mark, thanks for your reviews! I fixed all the issues you spotted. PTAL

http://reviews.llvm.org/D3985

Files:
  lib/Transforms/Scalar/SeparateConstOffsetFromGEP.cpp
  test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep-and-gvn.ll
  test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep.ll
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