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

[Hassnaa Hamdi via cfe-commits]

hassnaaHamdi wrote:

> 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?

Happy that you like it.
In terms of `TargetTransformInfo::preferPredicateOverEpilogue`, I will publish another PR to rename the `ScalarEpilogueLowering` enum and I will include that function also. I just tried to minimize this PR as mush as possible :'D

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