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

[Erich Keane via cfe-commits]

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@@ -7986,6 +7986,12 @@ void Parser::ParseParameterDeclarationClause(
     if (getLangOpts().HLSL)
       MaybeParseHLSLAnnotations(DS.getAttributes());
 
+    if (ParmDeclarator.getDeclarationAttributes().size() &&
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erichkeane wrote:

```suggestion
    if (!ParmDeclarator.getDeclarationAttributes().empty() &&
```

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