[llvm] [LV, VP]VP intrinsics support for the Loop Vectorizer + adding new tail-folding mode using EVL. (PR #76172)

[via llvm-commits]

https://github.com/ayalz commented:

I'm OK, pending Florian's approval.
It unfortunately leaves several clean-ups to be addressed as TODO follow-ups.
Added several minor suggestions for improvement.

https://github.com/llvm/llvm-project/pull/76172