[PATCH] D68397: [DAGCombiner] add operation legality checks before creating shift ops (PR43542)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

I've always wondered why in DAGCombine we create nodes rarely consulting with `TLI.isOperation*()`.
This patch explains it :/ Looks ok to me..


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  https://reviews.llvm.org/D68397/new/

https://reviews.llvm.org/D68397