Deprecate any uses of class_name with Class objects in put_or_update #18831
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Rails 5.1 dropped support for query values of type Class, and we should
have fixed most of them with #18827 and #18829, but since detecting
callers to put_or_update that do this could be difficult, we can still
support this by "fixing" it so rails 5.1 doesn't raise an exception,
and give us time to fix the caller.