Editorial: Allow passing pre-looked-up Calendar methods

Do the same for CalendarDateFromFields as in CalendarDateAdd and
CalendarDateUntil: add an optional parameter to CalendarFields which can
supply the method to be called, in case the caller has already looked it
up.

This doesn't make any observable change, but it will be used for
optimizations in #2519.

UPSTREAM_COMMIT=b9ee4e2b1fd20258a964f75e6b40da24e45161e1

Author: ptomato

lib/ecmascript.ts

@@ -2521,15 +2521,16 @@ export function ConsolidateCalendars(one: CalendarSlot, two: CalendarSlot) {
 export function CalendarDateFromFields(
   calendar: CalendarSlot,
   fields: CalendarProtocolParams['dateFromFields'][0],
-  options?: Partial<CalendarProtocolParams['dateFromFields'][1]>
+  options?: Partial<CalendarProtocolParams['dateFromFields'][1]>,
+  dateFromFieldsParam?: Temporal.CalendarProtocol['dateFromFields']
 ) {
   if (typeof calendar === 'string') {
     const TemporalCalendar = GetIntrinsic('%Temporal.Calendar%');
     const calendarObj = new TemporalCalendar(calendar);
     return Call(GetIntrinsic('%Temporal.Calendar.prototype.dateFromFields%'), calendarObj, [fields, options]);
   }
-  const dateFromFields = GetMethod(calendar, 'dateFromFields');
-  let result = Call(dateFromFields, calendar, [fields, options]);
+  const dateFromFields = dateFromFieldsParam ?? GetMethod(calendar, 'dateFromFields');
+  const result = Call(dateFromFields, calendar, [fields, options]);
   if (!IsTemporalDate(result)) throw new TypeError('invalid result');
   return result;
 }