[llvm] [LV] Make ScalarEpilogue a LoopVectorizeHint (PR #160125)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> > as it is really a kind of hint that's dependent on the user's preferences
> 
> Aren't loop hints for loop pragmas etc? I don't think the user can control whether or not a scalar epilogue is emitted on a loop by loop basis. `-prefer-predicate-over-epilogue` is more of a TTI override

Hm, by that reasoning isn't ForceScalableVectorization, which is also a hint, also a TTI override?

https://github.com/llvm/llvm-project/pull/160125