[InstCombine] canonicalize fcmp+select to minnum/maxnum intrinsics
This is the opposite direction of D62158 (we have to choose 1 form or the other).
Now that we have FMF on the select, this becomes more palatable. And the benefits
of having a single IR instruction for this operation (less chances of missing folds
based on extra uses, etc) overcome my previous comments about the potential advantage
of larger pattern matching/analysis.
Differential Revision: https://reviews.llvm.org/D62414
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364721
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