hg: shenandoah/jdk: Added a few missed worker sessions for worker tasks

[zgu at redhat.com]

Changeset: d50fff296ce6
Author:    zgu
Date:      2018-10-09 13:25 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/d50fff296ce6

Added a few missed worker sessions for worker tasks

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