RFR [16/java.xml] 8246816: XMLGregorianCalendar.hashCode() produces far too many identical hashes

[Joe Wang]

Hello,

Please review a fix for the hashCode generation.

JBS: https://bugs.openjdk.java.net/browse/JDK-8246816

webrev: http://cr.openjdk.java.net/~joehw/jdk16/8246816/webrev/

Thanks,
Joe