message: Add implementation of `remove_cvref_t` from C++20.
diff: @@ -73,6 +73,11 @@ using detected_or_t =
  typename type_traits_internal::detected_impl<Default, void, Op,
  Args...>::type;
  +// Alias to type T with removed reference, const, and volatile qualifiers.
  +// Backport from C++20.
  +template <class T>
  +using remove_cvref_t = std::remove_cv_t<std::remove_reference_t<T>>;
  +
  } // namespace verible
  #endif // VERIBLE_COMMON_UTIL_TYPE_TRAITS_H_
  