[PATCH] D133866: [SelectionDAG] Add helper function to check whether a SDValue is neutral element. NFC.

[Yeting Kuo via Phabricator via llvm-commits]

fakepaper56 added a comment.

I am not sure what is the compatibility issue. I think `foldSelectWithIdentityConstant` could be also used for operations which not have communicative property.


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https://reviews.llvm.org/D133866