hg: shenandoah/jdk9/hotspot: Cleanup duplicated Shenandoah task queue declarations

[zgu at redhat.com]

Changeset: 504e54baf306
Author:    zgu
Date:      2017-04-05 11:16 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/504e54baf306

Cleanup duplicated Shenandoah task queue declarations

! src/share/vm/gc/shenandoah/shenandoahConcurrentMark.hpp
! src/share/vm/gc/shenandoah/shenandoahOopClosures.hpp