[lld] [lld][ELF] Reject TLS relocations against non-STT_TLS symbols (PR #228418)

[Fangrui Song via llvm-commits]

https://github.com/MaskRay requested changes to this pull request.

Requesting changes to prevent this from being merged prematurely. Agentic coding tools tend to be overly verbose, so please take some time to trim unnecessary comments.

https://github.com/llvm/llvm-project/pull/228418