hg: shenandoah/jdk10: Eliminate string dedup cleanup phase and correct UR closure

[zgu at redhat.com]

Changeset: a6364ccc8081
Author:    zgu
Date:      2017-10-19 12:01 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/rev/a6364ccc8081

Eliminate string dedup cleanup phase and correct UR closure

! src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/shenandoah/shenandoahPhaseTimings.cpp
! src/hotspot/share/gc/shenandoah/shenandoahPhaseTimings.hpp
! src/hotspot/share/gc/shenandoah/shenandoahStringDedup.cpp
! src/hotspot/share/gc/shenandoah/shenandoahStringDedup.hpp
! test/hotspot/jtreg/gc/shenandoah/TestShenandoahStrDedup.java