[lld] [llvm] [llvm][lld][NFC] Avoid reopening namespace std (PR #96450)

[Jakub Kuderski via llvm-commits]

https://github.com/kuhar commented:

Why would we prefer this over the existing implementation?

Last time I tried this, it didn't compile across all of the compilers supported by llvm. This is a vague recollection, I don't remember the details.

https://github.com/llvm/llvm-project/pull/96450