hg: jdk9/hs/hotspot: 8157620: Guarantee in run_task(task, num_workers) fails

[jon.masamitsu at oracle.com]

Changeset: cb9fa0039221
Author:    jmasa
Date:      2016-05-25 09:28 -0700
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/cb9fa0039221

8157620: Guarantee in run_task(task, num_workers) fails
Reviewed-by: tschatzl, drwhite

! src/share/vm/gc/shared/workgroup.cpp
! src/share/vm/gc/shared/workgroup.hpp
! test/gc/stress/TestGCOld.java