RFR: JDK-8079840: G1StringDedupTable::deduplicate() reset String hash value unnecessarily

[Jiangli Zhou]

Hi,

Please review following small fix that avoids reseting the String’s hash value unnecessarily during G1StringDedupTable::deduplicate().

Webrev
http://cr.openjdk.java.net/~jiangli/8079840/webrev.00/

Bug
https://bugs.openjdk.java.net/browse/JDK-8079840

Tested with JPRT.

Thanks,
Jiangli