[clang] [llvm] [HIPSPV] Add in-tree SPIR-V backend support for chipStar (PR #186972)

[Paulius Velesko via cfe-commits]

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@@ -91,7 +91,8 @@ SPIRVSubtarget::SPIRVSubtarget(const Triple &TT, const std::string &CPU,
   if (TargetTriple.getOS() == Triple::Vulkan)
     Env = Shader;
   else if (TargetTriple.getOS() == Triple::OpenCL ||
-           TargetTriple.getVendor() == Triple::AMD)
+           TargetTriple.getVendor() == Triple::AMD ||
+           TargetTriple.getOS() == Triple::ChipStar)
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pvelesko wrote:

> doesn't matter unless/until chipStar adds a driver backend that requires Vulkan

I have a branch that converts our generated SPIRV from OpenCL to Vulkan SPIRV. This is for simplifying integration with clvk - converting SPIRV to Vulkan SPIRV on our side allows us to bypass the clspv component of clvk. 

Not sure if this is something that will ever get merged or how that would affect llvm if so. 

@linehill 

https://github.com/llvm/llvm-project/pull/186972