Generate cleaner code for Unit-typed if-else expressions

Instead of generating an assignment to a Unit-typed variable, just add
the Unit value after the if-else expression:

    [async] scala.async.Async.async[Unit]({
      val f: scala.concurrent.Future[Int] = AnfTestClass.this.base(y);
      if (y.>(0))
        State.result_=(scala.async.Async.await[Int](f).+(2))
      else
        State.result_=(scala.async.Async.await[Int](f).-(2))
    })
    [async] ANF transform expands to:
    {
      val f: scala.concurrent.Future[Int] = AnfTestClass.this.base(y);
      if (y.>(0))
        {
          val await$8: Int = scala.async.Async.await[Int](f);
          State.result_=(await$8.+(2))
        }
      else
        {
          val await$9: Int = scala.async.Async.await[Int](f);
          State.result_=(await$9.-(2))
        };
      ()
    }

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