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

[via cfe-commits]

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+// RUN: not %clang -target spirv %s 2>&1 | FileCheck %s --check-prefix=CHECK-VULKAN
+// RUN: not %clang -target spirv-vulkan-mlibc %s 2>&1 | FileCheck %s --check-prefix=CHECK-SHADER
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PrabbyDD wrote:

WHat is the difference between driver and frontend? Is frontend the actual compiler based stuff and driver is for compiler tooling? 

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