[PATCH] [IndVarSimplify] Widen signed loop compare instructions to enable additional optimizations.

[Chad Rosier]

Revised patch which now handles unsigned compares.

http://reviews.llvm.org/D5333

Files:
  lib/Transforms/Scalar/IndVarSimplify.cpp
  test/Transforms/IndVarSimplify/no-iv-rewrite.ll
  test/Transforms/IndVarSimplify/verify-scev.ll
  test/Transforms/IndVarSimplify/widen-loop-comp.ll
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