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

[Vineet Kumar via llvm-commits]

vntkmr wrote:

@alexey-bataev I just noticed that this patch is merged, good work!
As you might remember, I was the original author of this patch [back in 2021 while at BSC](https://lists.llvm.org/pipermail/llvm-dev/2021-April/149580.html), before you took over. 

I noticed that because of the move from phabricator to github, some of the history of this patch is now lost - I can't find a way to access the initial commits and discussions on the patch from 2021. 
I will appreciate if you can add an acknowledgement for the initial work on this patch.

CC: @rofirrim @simoll 

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