[llvm] [LoopUnroll][NFC] Clean up remainder followup metadata handling (PR #165272)

[Michael Kruse via llvm-commits]

https://github.com/Meinersbur approved this pull request.

LGTM. One of the `makeFollowupLoopID` indeed seems redundant.

Since we are not completely sure this is dead code (do did you find it?), maybe use NFCI in the title.



https://github.com/llvm/llvm-project/pull/165272