[clang] [llvm] [HLSL][SPIR-V] Add Vulkan to target triple (PR #76749)

[Natalie Chouinard via cfe-commits]

https://github.com/sudonatalie commented:

Will wait for a +1 from @llvm-beanz or @bogner since I modified the error messages slightly for DXIL too

https://github.com/llvm/llvm-project/pull/76749