[clang] [Clang] Introduce '--offload-targets=' to generically target toolchains (PR #125556)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

Apologies, if I am missing it but I don't see a test emitting the diagnostic `err_drv_mix_offload` anywhere.

https://github.com/llvm/llvm-project/pull/125556