[PATCH] IndVarSimplify: Don't let LFTR compare against a poison value

[David Majnemer]

Closed by commit rL217102 (authored by @majnemer).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5174

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-extend-const.ll
  llvm/trunk/test/Transforms/IndVarSimplify/lftr-reuse.ll
  llvm/trunk/test/Transforms/IndVarSimplify/pr20680.ll
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