[PATCH] D71567: [InstCombine] Add tests for `select + mul` for power of twos. NFC

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

You probably want to throw in some vector `undef` tests as well.
(e.g. a singled lane in one of constants, the same lane in both, different lanes in each)


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