[clang] [llvm] [clang][Driver] Add HIPAMD Driver support for AMDGCN flavoured SPIR-V (PR #95061)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 approved this pull request.

Out of curiosity, how badly does this fail when you use `--offload-new-driver` w/ HIP? I swear I'll get that passing the internal test suite eventually, there's a single case for emitting IR that comgr uses that I can't seem to fix.

https://github.com/llvm/llvm-project/pull/95061