[lld] [ELF] Fix unnecessary inclusion of unreferenced provide symbols (PR #84512)

[Fangrui Song via llvm-commits]

MaskRay wrote:

Congratulations on the first patch:) Very well prepared.

I am landing this patch manually as you have a hidden email address. This repository prefers a non-hidden email address
https://discourse.llvm.org/t/hidden-emails-on-github-should-we-do-something-about-it/74223/32
(otherwise, you won't even receive build bot notifications)

https://github.com/llvm/llvm-project/pull/84512