Conditional branch to *truebr* if *cond* is true, else to *falsebr*.

def cbranch(self, cond, truebr, falsebr):
        """
        Conditional branch to *truebr* if *cond* is true, else to *falsebr*.
        """
        br = instructions.ConditionalBranch(self.block, "br",
                                            [cond, truebr, falsebr])
        self._set_terminator(br)
        return br