llvm-project

673c324a - [VectorCombine] foldInsExtVectorToShuffle - canonicalize new shuffle(undef,x) -> shuffle(x,undef).

[VectorCombine] foldInsExtVectorToShuffle - canonicalize new shuffle(undef,x) -> shuffle(x,undef). foldInsExtVectorToShuffle is likely to be inserting into an undef value, so make sure we've canonicalized this to the RHS in the folded shuffle to help further VectorCombine folds. Minor tweak to help #34072