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

[Tony Guillot via cfe-commits]

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@@ -374,7 +374,7 @@ Bug Fixes in This Version
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 - Fixed atomic boolean compound assignment; the conversion back to atomic bool would be miscompiled. (#GH33210)
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+- Fixed an issue where an assert was thrown instead of an error if no vulkan env was specified with -target spirv (#GH189964) 
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to268 wrote:

It would be better to put it at the end of the section instead.

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