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

[Alastair Houghton via llvm-commits]

al45tair wrote:

As for whether we should support `GLOB_DAT` for other architectures, sure, that probably makes sense, wherever this gets fixed. Other architectures appear to use `S + A` rather than just `S` for `GLOB_DAT`, but again `RelocationResolver` has all the information it needs to compute that.

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