[llvm] [LV][NFC] Rename ScalarEpilogueLowering to EpilogueLowering (PR #191871)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

I think createInterleaveGroups still has a variable `ScalarEpilogueAllowed` , which should also be updated.

https://github.com/llvm/llvm-project/pull/191871