[lld] Revert "[lld][AMDGPU] Support R_AMDGPU_ABS32_(LO|HI) relocations" (PR #191591)

[Fangrui Song via llvm-commits]

MaskRay wrote:

I have to merge the revert. This ensures the git log will be clean when you reland is reviewed and merged.

This is important to make sure lld/ELF changes get reviewed by someone familiar with the code, rather than getting approved by folks who aren't as close to it - especially in this case author's colleague who even self-describes as not being familiar with ELF/linker.

https://github.com/llvm/llvm-project/pull/191591