[llvm] Revert "[Object][x86-64] Add support for `R_X86_64_GLOB_DAT` relocations. (#103029)" (PR #103497)

[Alastair Houghton via llvm-commits]

al45tair wrote:

I don't have merge rights, but as I said on the original PR, I think we're going to go the other way and fix it in `swift-reflection-dump` instead. The change is trivial and _if_ I had merge/review rights here I'd happily approve and/or merge it. // @lhames.

https://github.com/llvm/llvm-project/pull/103497