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

[Tony Guillot via cfe-commits]

to268 wrote:

I would wait a bit before triggering a new build since someone broke an LLDB test (there is no way that patch breaks it):
```
  Failed Tests (1):
    lldb-api :: tools/lldb-dap/variables/TestDAP_variables.py
```

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