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

[Rainer Orth via cfe-commits]

rorth wrote:

This patch also broke the [Solaris/amd64 buildbot](https://lab.llvm.org/staging/#/builders/8/builds/484).  I suspect this happens because that one is configured with `-DLLVM_TARGETS_TO_BUILD=X86`, thus lacking cuda support.  In fact, when manually building with support for all targets, the test `PASS`es. Please fix.

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