check if this state might be used in unicorn (has no concrete register)

def _check_registers(self, report=True):
        ''' check if this state might be used in unicorn (has no concrete register)'''
        for r in self.state.arch.uc_regs.keys():
            v = getattr(self.state.regs, r)
            processed_v = self._process_value(v, 'reg')
            if processed_v is None or processed_v.symbolic:
                #l.info('detected symbolic register %s', r)
                if report:
                    self._report_symbolic_blocker(v, 'reg')
                return False

        if self.state.arch.vex_conditional_helpers:
            flags = ccall._get_flags(self.state)[0]
            processed_flags = self._process_value(flags, 'reg')
            if processed_flags is None or processed_flags.symbolic:
                #l.info("detected symbolic rflags/eflags")
                if report:
                    self._report_symbolic_blocker(flags, 'reg')
                return False

        #l.debug('passed quick check')
        return True