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

[Shilei Tian via llvm-commits]

shiltian wrote:

Yeah, that needs to be fixed. The command line argument is `--target=hexagon-unknown-elf-unknown`, which is a valid target triple, but the error is `hexagon-unknown-unknown-elf-unknown`. That definitely exposes the issue in the compiler driver.

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