[llvm] [SLP] Exit early if MaxVF < MinVF (NFCI). (PR #83283)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

> > Hmm, I don't think this is NFC, would be good to have a test
> 
> Yes I think technically this could change dbg output. Let me add a test for that.

Not a debug, I think it may change vectorization output

https://github.com/llvm/llvm-project/pull/83283