8074032: Instant.ofEpochMilli(millis).toEpochMilli() can throw arithmetic overflow in toEpochMilli()
Summary: Instant.toEpochMilli() now takes into account the sign of the 'seconds' field.
Reviewed-by: rriggs, scolebourne

8003680: JSR 310 Date/Time API
Summary: Integration of JSR310 Date/Time API for M6
Reviewed-by: alanb, naoto, dholmes
Contributed-by: scolebourne@joda.org, roger.riggs@oracle.com, richard.warburton@gmail.com, misterm@gmail.com