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

[Fangrui Song via llvm-commits]

MaskRay wrote:

I stared at https://github.com/swiftlang/llvm-project/pull/9095 , which gives no context why GLOB_DAT is needed. Do you have more information? RelocationResolver is primarily(exclusively?) for relocatable files. Therefore dynamic relocations are not needed.

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