[PATCH] Disable indvar widening if arithmetics on the wider type are more expensive

[Jingyue Wu]

rebase against the latest version

http://reviews.llvm.org/D6196

Files:
  lib/Target/NVPTX/NVPTXTargetTransformInfo.cpp
  lib/Transforms/Scalar/IndVarSimplify.cpp
  test/Transforms/IndVarSimplify/no-widen-expensive.ll
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