8245407: Enhance zoning of times

Reviewed-by: rriggs, rhalade, skoivu

Author: naotoj

src/java.base/share/classes/java/util/Calendar.java

@@ -2728,7 +2728,9 @@ public boolean equals(Object obj) {
                 lenient == that.lenient &&
                 firstDayOfWeek == that.firstDayOfWeek &&
                 minimalDaysInFirstWeek == that.minimalDaysInFirstWeek &&
-                zone.equals(that.zone);
+                (zone instanceof ZoneInfo ?
+                    zone.equals(that.zone) :
+                    zone.equals(that.getTimeZone()));
         } catch (Exception e) {
             // Note: GregorianCalendar.computeTime throws
             // IllegalArgumentException if the ERA value is invalid