hg: shenandoah/jdk: Added logging for the number of workers used for GC cycles

[zgu at redhat.com]

Changeset: 1cfc18a97d6f
Author:    zgu
Date:      2018-06-12 16:48 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/1cfc18a97d6f

Added logging for the number of workers used for GC cycles

! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/shenandoah/shenandoahWorkGroup.cpp
! src/hotspot/share/gc/shenandoah/shenandoahWorkGroup.hpp
! src/hotspot/share/gc/shenandoah/shenandoahWorkerPolicy.cpp