llvm-project

6ec66a22 - [X86] Move VPERMV3(X,M,Y) -> VPERMV(M,CONCAT(X,Y)) fold after general VPERMV3 canonicalization

[X86] Move VPERMV3(X,M,Y) -> VPERMV(M,CONCAT(X,Y)) fold after general VPERMV3 canonicalization Pulled out of #133923 - this prevents regressions with SimplifyDemandedVectorEltsForTargetNode exposing VPERMV3(X,M,X) repeated operand patterns which were getting concatenated to wider VPERMV nodes before simpler canonicalizations could clean them up.