8169527: Typo in getCalendarType() method of Chronology class
Reviewed-by: bpb

8030864: Add an efficient getDateTimeMillis method to java.time
Summary: Added epochSecond method in Chronology and overided it in IsoChronology
Reviewed-by: rriggs, scolebourne

8141652: Rename methods Objects.nonNullElse* to requireNonNullElse*
Summary: And some usages of replacing expr != null ? expr : otherexpr
Reviewed-by: jrose, chegar

8067800: Unexpected DateTimeException in the java.time.chrono.HijrahChronology.isLeapYear
Summary: Check the year range consistently with other Hijrah date years
Reviewed-by: lancea, scolebourne

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com