[PATCH] [TTI] Teach the cost heuristic how to query TLI to check if a zext/trunc is "free" for the target.

[Phabricator]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7585

Files:
  llvm/trunk/include/llvm/Analysis/TargetTransformInfoImpl.h
  llvm/trunk/include/llvm/CodeGen/BasicTTIImpl.h
  llvm/trunk/test/Transforms/SimplifyCFG/X86/speculate-cttz-ctlz.ll

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