[PATCH] Teach ScalarEvolution to sharpen range information.

[Sanjoy Das]

Address Hal's review.

http://reviews.llvm.org/D5639

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Transforms/IndVarSimplify/sharpen-range-metadata.ll
  test/Transforms/IndVarSimplify/widen-loop-comp.ll
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