replaceState(oldState, newState) {
    return new FinallyState(
        State.replaceStateId(this.finallyState, oldState, newState),
        State.replaceStateId(this.fallThroughState, oldState, newState),
        this.replaceAllStates(oldState, newState),
        this.replaceNestedTrys(oldState, newState));
  }
@param {number} oldState
@param {number} newState
@return {FinallyState}