[PATCH] [IndVarSimplify] Widen loop compares for unsigned IVs that have a uniform step of one.

[Chad Rosier]

Hi atrick, jmolloy,

This patch extends r217953 to handle unsigned comparison, which requires special handling due to unsigned wrapping.

I believe this is safe, but kicking off full correctness runs now..

 Chad

http://reviews.llvm.org/D5526

Files:
  lib/Transforms/Scalar/IndVarSimplify.cpp
  test/Transforms/IndVarSimplify/widen-loop-comp.ll
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