[PATCH] Fix PR22222

[Sanjoy Das]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6979

Files:
  llvm/trunk/lib/Transforms/Utils/SimplifyIndVar.cpp
  llvm/trunk/test/Transforms/IndVarSimplify/pr22222.ll
  llvm/trunk/test/Transforms/IndVarSimplify/strengthen-overflow.ll

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