[llvm] [LV]: Ensure fairness when selecting epilogue VF. (PR #155547)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

It looks like `LLVM.Transforms/LoopVectorize/AArch64/interleaving-reduction.ll` is failing in pre-commit, probably needs a rebase + test update?

https://github.com/llvm/llvm-project/pull/155547