[lld] [LLD][COFF] Add support for `--time-trace` (PR #68236)

[Tobias Hieta via llvm-commits]

tru wrote:

Nice! I was looking into this the other day so it's nice you took the time to implement it! Also hammers home the time we spend in the PDB writer doesn't it :)

I'll review the code later this week! But I suspect I won't have to much to add. 

https://github.com/llvm/llvm-project/pull/68236