Craig Topper 469da663f2 [InstSimplify] Re-enable select ?, undef, X -> X transform when X is provably not poison ...

Follow up from the transform being removed in D83360. If X is probably not poison, then the transform is safe.

Still plan to remove or adjust the code from ConstantFolding after this.

Differential Revision: https://reviews.llvm.org/D83440

2020-07-09 12:21:03 -07:00

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