[lld] [LLD][COFF] Ensure .bss is merged at the end of a section. (PR #137677)

[Martin Storsjö via llvm-commits]

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

Overall LGTM, with just one question just to be sure, and one request for an added comment.

After approving, I'd wait a day or two here in case someone else might want to speak up about this (e.g. with suggestions about other ways of doing it?), but this looks acceptable to me.

Thanks!

https://github.com/llvm/llvm-project/pull/137677