[lld] [X86, lld] Handle relocation R_X86_64_REX2_GOTPCRELX (PR #109783)

[Fangrui Song via llvm-commits]

MaskRay wrote:

Since llvm does not add `R_X86_64_CODE_4_GOTPCRELX`, it should be removed from the description .

https://github.com/llvm/llvm-project/pull/109783