[clang] Let clang-cl support CUDA/HIP (PR #68921)

[Nico Weber via cfe-commits]

nico wrote:

Hello, it looks like this breaks check-clang on mac: http://45.33.8.238/macm1/71368/step_7.txt

Please take a look and revert for now if it takes a while to fix.

https://github.com/llvm/llvm-project/pull/68921