[llvm] [Bitcode][NFC] Add abbrev for FUNC_CODE_DEBUG_LOC (PR #146497)

[Jeremy Morse via llvm-commits]

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

IMO that clearly justifies this course of action. LGTM!

(If there are stronger opinions out there we can revert back).

https://github.com/llvm/llvm-project/pull/146497