[PATCH] Make InstCombine aware of TargetTransformInfo when optimize extension

[Xuetian Weng]

add datalayout test case to make sure it will not pass in old code


http://reviews.llvm.org/D10750

Files:
  lib/Transforms/InstCombine/InstCombineCasts.cpp
  lib/Transforms/InstCombine/InstCombineInternal.h
  lib/Transforms/InstCombine/InstructionCombining.cpp
  test/Transforms/InstCombine/NVPTX/lit.local.cfg
  test/Transforms/InstCombine/NVPTX/no-widen-expensive.ll

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