RFR:8134928:java.time.Instant.truncatedTo(TemporalUnit unit) is truncating up if the year < 1970

[nadeesh tv]

Hi all,

Please review a fix for https://bugs.openjdk.java.net/browse/JDK-8134928

Issue- java.time.Instant.truncatedTo(TemporalUnit unit) is truncating up 
if the year < 1970

BugId -  https://bugs.openjdk.java.net/browse/JDK-8134928

webrev -  http://cr.openjdk.java.net/~pchopra/8134928/webrev.01/

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Thanks and Regards,
Nadeesh TV