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

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PrabbyDD wrote:

Ok I should have removed the formatting changes on the whole file and just applied it to my changes, and I retested it on my end and it triggered the error, in addition to making the title changes. If there is something else please let me know. 

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