[llvm] [LV]Set tailfolding styles before computing feasible max VF. (PR #91403)

[Florian Hahn via llvm-commits]

fhahn wrote:

Is this just the refactoring to move the point where tail-folding styles are computed? I might have missed this, but can the test changes be avoided?

https://github.com/llvm/llvm-project/pull/91403