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

[Jacob Lambert via llvm-commits]

lamb-j wrote:

Is there a way for us to still support 3-field triples and generic targets?

In the past we worked to allow 3-field triples as bundler inputs. I would be surprised if adding a 4-field restriction didn't break something internally.

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