[llvm] [LV, VP]VP intrinsics support for the Loop Vectorizer (PR #76172)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

The update regarding AVL/EVL. I missed one point here, when we discussed it before.
1. AVL can be referred as the input parameter for llvm.experimental.get.vector.length intrinsic.
2. EVL is the result, returned by this intrinsic.

So, this 2 subject are separate. For this reason the corresponding parameter in LLVM IR  Reference manual (https://llvm.org/docs/LangRef.html) for VP-based intrinsics is named as `%evl` and we use it here as EVL.


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