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

[Lang Hames via llvm-commits]

lhames wrote:

@MaskRay `RelocationResolver` is used in Swift reflection on Linux. Including dynamic relocations seems reasonable -- as far as I'm aware `RelocationResolver` isn't used in any contexts where the extra cases would hurt performance.

https://github.com/llvm/llvm-project/pull/103029