[PATCH] D155900: [TTI][NFCI] Introduce two new target transform hooks

[Johannes Doerfert via Phabricator via llvm-commits]

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`TargetTransformInfo::isValidTypePairForCallEdge` and
`TargetTransformInfo::isValidCallBaseForCallee` allow the middle end to
prune potential call targets if such a call would be undefined.
It is not clear how agressive we want to be in the default
implementation.


https://reviews.llvm.org/D155900

Files:
  llvm/include/llvm/Analysis/TargetTransformInfo.h
  llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
  llvm/lib/Analysis/TargetTransformInfo.cpp

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