[PATCH] [SeparateConstOffsetFromGEP] inbounds zext => sext for better splitting

[Jingyue Wu]

Thanks! Updated the comments.

http://reviews.llvm.org/D4060

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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