[lld] [LLD][COFF] Add support for custom section layout (PR #152779)

[Martin Storsjö via llvm-commits]

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

LGTM, thank you! I'll merge this soon (unless I forget...) unless @aganea or others have further comments.

https://github.com/llvm/llvm-project/pull/152779