[llvm] [LV][NFC]Preselect folding style before choosing maxing VF, NFC. (PR #81885)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

Thanks for splitting this off! Could you add a brief description including a reference to the PR that will use this?

It is a bit unfortunate that we need to account for 2 possible TF styles, but I don't think there's really any way around that at the moment, as we have to commit to one (or possibly 2) styles up front

https://github.com/llvm/llvm-project/pull/81885