visibility: Add create_private() static function

When parsing a visibility in `parse_visibility`, it is not an error to
not have a pub token: It simply means we want to create a private
visibility. If we had C++14 or another language, we could instead
represent all visibilities as an optional<AST::Visibility> where the
Visibility class would not need to change. But I think the best course
of action for our case is to instead keep visibilities even when they
are private and have a special case in the `VisKind` enumeration.

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