hg: jdk/sandbox: 8212074: Add method to peek the remaining tasks in task queues

[chris.hegarty at oracle.com]

Changeset: cb20bf10cfbd
Author:    zgu
Date:      2018-10-15 11:53 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/cb20bf10cfbd

8212074: Add method to peek the remaining tasks in task queues
Summary: Add methods for implementing new task termination protocol
Reviewed-by: tschatzl, shade, rkennke

! src/hotspot/share/gc/shared/taskqueue.hpp