[PATCH] This patch reverts some changes that were made to fix PR20680.

[Sanjoy Das]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7979

Files:
  llvm/trunk/lib/Transforms/Scalar/IndVarSimplify.cpp
  llvm/trunk/test/Transforms/IndVarSimplify/2011-10-27-lftrnull.ll
  llvm/trunk/test/Transforms/IndVarSimplify/lftr-address-space-pointers.ll
  llvm/trunk/test/Transforms/IndVarSimplify/lftr-reuse.ll

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