hg: shenandoah/jdk: Remove ShenandoahCancelledTerminatorTerminator and simplify aborted paths

[zgu at redhat.com]

Changeset: 9b9d857bd372
Author:    zgu
Date:      2018-12-12 13:50 -0500
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/9b9d857bd372

Remove ShenandoahCancelledTerminatorTerminator and simplify aborted paths

! src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.cpp
! src/hotspot/share/gc/shenandoah/shenandoahTaskqueue.cpp
! src/hotspot/share/gc/shenandoah/shenandoahTaskqueue.hpp
! src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp