[clang] [clang] [C++20] Defaulted operator== doesn't lookup in using-directive properly #97087 (PR #99542)

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================
@@ -124,7 +124,7 @@ NamedDecl *Parser::ParseCXXInlineMethodDef(
                       ? diag::warn_cxx98_compat_defaulted_deleted_function
                       : diag::ext_defaulted_deleted_function)
         << 0 /* defaulted */;
-      Actions.SetDeclDefaulted(FnD, KWLoc);
+      Actions.SetDeclDefaulted(nullptr, FnD, KWLoc);
----------------
cor3ntin wrote:

```suggestion
      Actions.SetDeclDefaulted(/*Scope=*/nullptr, FnD, KWLoc);
```

Ditto everywhere you pass a nullptr.

Alternatively, declare `SetDeclDefaulted` as

``void SetDeclDefaulted(Decl *dcl, SourceLocation DefaultLoc, Scope *S = 
nullptr);`

https://github.com/llvm/llvm-project/pull/99542
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