RFR:JDK-8146747:java.time.Duration.toNanos() and toMillis() exception on negative durations

[nadeesh tv]

Hi all,

Please review following

Bug Id : https://bugs.openjdk.java.net/browse/JDK-8146747 
<https://bugs.openjdk.java.net/browse/JDK-8146747>

Solution: Handled the negative duration separately

webrev : http://cr.openjdk.java.net/~ntv/8146747/webrev.00/ 
<http://cr.openjdk.java.net/%7Entv/8146747/webrev.00/>

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Thanks and Regards,
Nadeesh TV