[lld] [lld-macho] Make ObjC category checker print the source file name of … (PR #80221)

[Vincent Lee via llvm-commits]

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

LGTM, just a minor nit.

> However, I don't see an easy way to tell at this location if we're within the LTO scenario.

That's unfortunate. Spitting out some RandomFile might lead someone on a wild goose chase and I would prefer (if possible) to not even emit the source file in that scenario. In any case, this is already a quality improvement. 

https://github.com/llvm/llvm-project/pull/80221