[clang] [HLSL][RootSignature] Define and integrate rootsig clang attr and decl (PR #137690)

[Finn Plummer via cfe-commits]

================
@@ -949,6 +950,23 @@ void SemaHLSL::emitLogicalOperatorFixIt(Expr *LHS, Expr 
*RHS,
       << NewFnName << FixItHint::CreateReplacement(FullRange, OS.str());
 }
 
+void SemaHLSL::handleRootSignatureAttr(Decl *D, const ParsedAttr &AL) {
+  if (AL.getNumArgs() != 1) {
+    Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << AL << 1;
+    return;
+  }
+
----------------
inbelic wrote:

Should also validate that we haven't already received a root signature attr

https://github.com/llvm/llvm-project/pull/137690
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