Internal QPropertyBindingPrivatePtr, QArgumentType classes
also have been updated;
Replace class operators operator==(), operator!=() of
QRegularExpression to friend method comparesEqual() and
Q_DECLARE_EQUALITY_COMPARABLE macro.
Task-number: QTBUG-120304
Change-Id: I010617cbcb8bd6afb7c21ee4345398648821f72c
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>