[Clang] prevent errors for deduction guides using deduced type aliases (#117450) Fixes #54909 --- Clang incorrectly produces diagnostics for alias templates in deduction guides, treating them as separate from their underlying types. This issue arises because Clang doesn't properly handle `TypeAliasTemplateDecl` when comparing template names for equality in the context of deduction guides, resulting in diagnostics that don't align with the C++ standard. As the C++ standard specifies - _an alias template is considered a synonym for its underlying type_ With this change, Clang now correctly resolves alias templates to their underlying types in deduction guides, ensuring compliance with the C++ standard.
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