fix quantifier elimination bugs reported by Berdine and Bornat

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
fix quantifier elimination bugs reported by Berdine and Bornat

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
fix quantifier elimination bugs reported by Berdine and Bornat

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
fix model generation bug reported by Saga Chaki

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>