[clang] [Clang] disallow attributes on void parameters (PR #124920)

[Aaron Ballman via cfe-commits]

================
@@ -10329,6 +10329,13 @@ Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, 
DeclContext *DC,
       }
     }
 
+    if (FTIHasSingleVoidParameter(FTI)) {
+      ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[0].Param);
----------------
AaronBallman wrote:

```suggestion
      const auto *Param = cast<ParmVarDecl>(FTI.Params[0].Param);
```

https://github.com/llvm/llvm-project/pull/124920
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