Craig Topper 9b1e95329a [InstSimplify] Remove select ?, undef, X -> X and select ?, X, undef -> X transforms ...

As noted here https://lists.llvm.org/pipermail/llvm-dev/2016-October/106182.html and by alive2, this transform isn't valid. If X is poison this potentially propagates poison when it shouldn't.

This same transform still exists in DAGCombiner.

Differential Revision: https://reviews.llvm.org/D83360

2020-07-08 12:53:05 -07:00

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