smtfd incorrect result on formula with = and distinct

[muchang]

Hi,
For this formula,

(assert (= 0 1))
(assert (distinct 0 2))
(check-sat-using smtfd)

z3 gives an incorrect sat on this unsat formula.

OS: Ubuntu 18.04
Revision: 805ac74

[NikolajBjorner]

dont' use smtfd on non-finite domains. It isn't filtering in formulas not in scope at the moment.