[lld] [lld] Mark target section as code section when merging code sections into a data section. (PR #72030)

[Saleem Abdulrasool via llvm-commits]

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

I do remember something along these lines when I was playing with BFD and emulating link behaviour.

https://github.com/llvm/llvm-project/pull/72030