AdjustRoundedDurationDays: CreateDurationRecord is fallible

[anba]

The adjustedDateDuration and adjustedTimeDuration duration records can have different duration signs, which means the CreateDurationRecord call is fallible.

Test case:

let calendar = new class extends Temporal.Calendar {
  dateAdd(date, duration, options) {
    console.log(`dateAdd(${date}, ${duration})`);
    if (duration.days === 10) {
      return super.dateAdd(date, duration.negated(), options);
    }
    return super.dateAdd(date, duration, options);
  }
}("iso8601");

let zdt = new Temporal.ZonedDateTime(0n, "UTC", calendar);

let d = Temporal.Duration.from({
  days: 10,
  hours: 25,
});

let r = d.round({
  smallestUnit: "nanoseconds",
  roundingIncrement: 5,
  relativeTo: zdt,
});
console.log(r.toString());

[ptomato]

This will be addressed as part of #2727 (#2727 (comment) is basically about the same problem)