[clang] [llvm] [LV][NFC] Rename PreferPredicateOverEpilogue to PreferTailFolding (PR #191803)

[Luke Lau via cfe-commits]

https://github.com/lukel97 commented:

Thanks, I'm a big +1 on this. Predication is one of the many overloaded terms in the vectorizer and it would be good to disambiguate it.

Should we also rename `TargetTransformInfo::preferPredicateOverEpilogue` whilst we're at it?

https://github.com/llvm/llvm-project/pull/191803