c943966835
Always reset the Gregorian change date, because all uses either require the Gregorian change date to be set to `-8.64e15` or don't care about dates far into the past. The slow `DateIntervalFormat::TryFormatCalendar` is now only used when `MOZ_SYSTEM_ICU` is defined. And also resets the Gregorian change date for "buddhist", "japanese", and "roc" to get consistent results when compared to the ICU4X-based Temporal code. Differential Revision: https://phabricator.services.mozilla.com/D241644