[clang] [HLSL][SPIR-V] Handle SV_Postion builtin in PS (PR #141759)

[Farzon Lotfi via cfe-commits]

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@@ -764,6 +764,13 @@ void SemaHLSL::CheckSemanticAnnotation(
       return;
     DiagnoseAttrStageMismatch(AnnotationAttr, ST, {llvm::Triple::Compute});
     break;
+  case attr::HLSLSV_Position:
+    // TODO: allow use on other shader types & output once the overall semantic
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farzonl wrote:

Should we track this with an issue?

https://github.com/llvm/llvm-project/pull/141759