[lld] [X86][LLD] Handle R_X86_64_CODE_4_GOTPC32_TLSDESC relocation type (PR #116909)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> I'll commit first. Any further comments are welcome.

This patch looks good. I delegated the review to Kan.

Note, as a new contributor, it's important to avoid rushing through reviews.
A friendly ping and a quick land the next day can be perceived as rushing.

https://github.com/llvm/llvm-project/pull/116909