[clang] [HLSL][Clang] Support SV_VertexID semantic (PR #184640)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/CodeGen/CGHLSLRuntime.cpp clang/lib/Sema/SemaHLSL.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/CGHLSLRuntime.cpp b/clang/lib/CodeGen/CGHLSLRuntime.cpp
index 82aba22d3..7537cf962 100644
--- a/clang/lib/CodeGen/CGHLSLRuntime.cpp
+++ b/clang/lib/CodeGen/CGHLSLRuntime.cpp
@@ -771,7 +771,9 @@ llvm::Value *CGHLSLRuntime::emitSystemSemanticLoad(
   if (SemanticName == "SV_VERTEXID") {
     if (ST == Triple::EnvironmentType::Vertex) {
       if (CGM.getTarget().getTriple().isSPIRV())
-        return createSPIRVBuiltinLoad(B, CGM.getModule(), Type, Semantic->getAttrName()->getName(), /* BuiltIn::VertexIndex */ 42);
+        return createSPIRVBuiltinLoad(B, CGM.getModule(), Type,
+                                      Semantic->getAttrName()->getName(),
+                                      /* BuiltIn::VertexIndex */ 42);
       else
         return emitDXILUserSemanticLoad(B, Type, Semantic, Index);
     }
diff --git a/clang/lib/Sema/SemaHLSL.cpp b/clang/lib/Sema/SemaHLSL.cpp
index 50933fb8d..b43ddb786 100644
--- a/clang/lib/Sema/SemaHLSL.cpp
+++ b/clang/lib/Sema/SemaHLSL.cpp
@@ -1012,7 +1012,8 @@ void SemaHLSL::checkSemanticAnnotation(
     return;
   }
   if (SemanticName == "SV_VERTEXID") {
-    diagnoseSemanticStageMismatch(SemanticAttr, ST, SC.CurrentIOType, {{llvm::Triple::Vertex, IOType::In}});
+    diagnoseSemanticStageMismatch(SemanticAttr, ST, SC.CurrentIOType,
+                                  {{llvm::Triple::Vertex, IOType::In}});
     return;
   }
 

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https://github.com/llvm/llvm-project/pull/184640