[lld] [llvm] [LLD][COFF] Add more `--time-trace` tags for ThinLTO linking (PR #156471)

[Teresa Johnson via llvm-commits]

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

lgtm but I think it would be good to change occurrences of "full LTO" and "regular LTO" in the description to something like the "LTO thin link" to avoid confusion, as those terms typically refer specifically to IR based LTO.

https://github.com/llvm/llvm-project/pull/156471