[clang] [llvm] [OffloadBundler] Rework the ctor of `OffloadTargetInfo` to support AMDGPU's generic target (PR #122629)

[Shilei Tian via llvm-commits]

shiltian wrote:

@asb I did receive some emails initially but haven't gotten any lately. I assumed that issue had been fixed, as it seemed like the driver was just unconditionally adding `unknown`.

https://github.com/llvm/llvm-project/pull/122629