[PATCH] D81212: [X86] Teach combineVectorShiftImm to constant fold undef elements to 0 not undef.

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon accepted this revision.
RKSimon added a comment.

Possibly add a PSRAI test as well? Its more irregular than the logical shifts as it isn't necessarily zeros...


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