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

[Florian Hahn via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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fhahn wrote:

nit: better rename to vectorize-force-tail-with-evl.ll as no vp-intrinsics are generated ore referenced in the test

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