BinaryPredict's equals function compares ignore the op

[yangzhg]

Describe the bug
BinaryPredict's equals function compares ignore the op, the opcode is not init in this class, it will always be INVALID_OPCODE, so if a BinaryPredict has same child it will be qual, like a<1 and a>=1

    @Override
    public boolean equals(Object obj) {
        if (!super.equals(obj)) {
            return false;
        }
        return ((BinaryPredicate) obj).opcode == this.opcode;
    }