hg: shenandoah/jdk: ShenandoahPushWorkerQueuesScope should subclass ShenandoahPushWorkerScope

[zgu at redhat.com]

Changeset: ba1dfc3b67bf
Author:    zgu
Date:      2018-10-03 14:13 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/ba1dfc3b67bf

ShenandoahPushWorkerQueuesScope should subclass ShenandoahPushWorkerScope

! src/hotspot/share/gc/shenandoah/shenandoahWorkGroup.cpp
! src/hotspot/share/gc/shenandoah/shenandoahWorkGroup.hpp