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

[Hans Wennborg via llvm-commits]

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

I think there are some `importScope`s which may not actually be about importing, but overall lgtm.

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