[PATCH] IndVarSimplify: Allow LFTR to fire more often

[David Majnemer]

Hi nicholas, nlewycky, atrick,

I added a pessimization in r217102 to prevent miscompiles when the
incremented induction variable was used in a comparison; it would be
poison.

Try to use the incremented induction variable more often when we can be
sure that the increment won't end in poison.

http://reviews.llvm.org/D6222

Files:
  lib/Transforms/Scalar/IndVarSimplify.cpp
  test/Transforms/IndVarSimplify/lftr-extend-const.ll
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