[clang] [Clang][HLSL] Add environment parameter to availability attribute (PR #89809)

[Chris B via cfe-commits]

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llvm-beanz wrote:

I think the different slice there is platform vs language. SemaHLSL should be where HLSL tests go regardless of platform (DirectX or Vulkan), but we should try to keep HLSL separate from C/C++ tests.

https://github.com/llvm/llvm-project/pull/89809