[llvm] [LV] Drop the mask of a predicated store masked by the header mask. (PR #201676)

[Luke Lau via llvm-commits]

https://github.com/lukel97 approved this pull request.

LGTM. Do we have a test case somewhere for an unrolled replicate recipe w/ tail folding?

https://github.com/llvm/llvm-project/pull/201676