[clang] [Driver] Add support for GCC installation detection in Baremetal toolchain (PR #121829)

[Peter Smith via cfe-commits]

https://github.com/smithp35 approved this pull request.

Thanks for the updates. I've marked it approved on my side. As mentioned before you'll want to get Petr Hosek or someone from his team to approve on the RISCV side as I can't comment on that part.

https://github.com/llvm/llvm-project/pull/121829