hg: jdk9/hs-rt/hotspot: 8079840: G1StringDedupTable::deduplicate() reset String hash value unnecessarily.

[jiangli.zhou at oracle.com]

Changeset: 43fee4497230
Author:    jiangli
Date:      2015-05-11 15:06 -0400
URL:       http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/43fee4497230

8079840: G1StringDedupTable::deduplicate() reset String hash value unnecessarily.
Summary: Only set hash value if String's hash value was 0.
Reviewed-by: pliden, brutisso

! src/share/vm/gc_implementation/g1/g1StringDedupTable.cpp