RFR 9: 8067800: Unexpected DateTimeException in the java.time.chrono.HijrahChronology.isLeapYear

[Roger Riggs]

Please review this specification clarification of the range of Hijrah 
calendar variants.
The issue was exposed by a bug in the HijrahChronology.isLeapYear method.

Webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-leap-year-8067800/

Issue:
    https://bugs.openjdk.java.net/browse/JDK-8067800

A CCC may be needed.

Thanks, Roger