[X86] Improve `matchBinaryShuffle()`'s `BLEND` lowering with per-element...

[X86] Improve `matchBinaryShuffle()`'s `BLEND` lowering with per-element all-zero/all-ones knowledge

We can use `OR` instead of `BLEND` if either the element we are not picking is zero (or masked away);
or the element we are picking overwhelms (e.g. it's all-ones) whatever the element we are not picking:
https://alive2.llvm.org/ce/z/RKejao

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D109726