[clang] [Clang] diagnosing missing Vulkan environment when using SPIR-V triple (PR #190840)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

I think at least part of the testing issue is that you're running the driver (clang) rather than the frontend (clang -cc1).

https://github.com/llvm/llvm-project/pull/190840