Change the Datatype and lock state associated with this Varnode if various conditions are met - Don't change a previously locked Datatype (unless \b override flag is \b true) - Don't consider an \b undefined type to be locked - Don't change to an identical Datatype \param ct is the Datatype to change to \param lock is \b true if the new Datatype should be locked \param override is \b true if an ol
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