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

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

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

I added a new test where we unmask a store with tail-folding and UF = 2, thanks

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