[PATCH] [SeparateConstOffsetFromGEP] garbage-collect intermediate instructions

[Jingyue Wu]

removeConstOffset stops reusing instructions in UserChain

This ensures RecursivelyDeleteTriviallyDeadInstructions(UserChain.back()) can
remove all dead instructions in UserChain.


http://reviews.llvm.org/D9096

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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