[llvm] [LoopVectorizer] Prune VFs based on plan register pressure (PR #132190)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

It would be great to check the perf-impact on some benchmarks on AArch64, just to double check there are no unexpected regressions.

https://github.com/llvm/llvm-project/pull/132190