[clang] [llvm] [HLSL] implement `mad` intrinsic (PR #83826)

[Farzon Lotfi via cfe-commits]

================
@@ -5298,6 +5298,14 @@ bool Sema::CheckHLSLBuiltinFunctionCall(unsigned 
BuiltinID, CallExpr *TheCall) {
       return true;
     break;
   }
+  case Builtin::BI__builtin_hlsl_mad: {
+    if (checkArgCount(*this, TheCall, 3))
+      return true;
+    if (CheckVectorElementCallArgs(this, TheCall))
+      return true;
+    if (SemaBuiltinElementwiseTernaryMath(TheCall, false))
----------------
farzonl wrote:

i usually do, but this one shows up via vscode clangd extension and it threw me 
off.

https://github.com/llvm/llvm-project/pull/83826
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