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

[Nathan Gauër via cfe-commits]

================
@@ -407,6 +429,13 @@ llvm::Value *CGHLSLRuntime::emitInputSemantic(IRBuilder<> 
&B,
     llvm::Function *GroupIDIntrinsic = CGM.getIntrinsic(getGroupIdIntrinsic());
     return buildVectorInput(B, GroupIDIntrinsic, Ty);
   }
+  if (D.hasAttr<HLSLSV_PositionAttr>()) {
+    if (getArch() == llvm::Triple::spirv)
+      return createSPIRVBuiltinLoad(B, CGM.getModule(), Ty, "sv_position",
+                                    /* BuiltIn::Position */ 0);
+    llvm_unreachable(
+        "Shader signature for semantics not implemented for DXIL.");
----------------
Keenuts wrote:

Right, rephrased the error to be more target-agnostic.

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