hg: shenandoah/jdk10: Add ShenandoahRootProcessor API to report threads while scanning roots

[roman at kennke.org]

Changeset: bd01b07ba0d7
Author:    rkennke
Date:      2018-01-23 21:20 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/rev/bd01b07ba0d7

Add ShenandoahRootProcessor API to report threads while scanning roots

! src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/shenandoah/shenandoahMarkCompact.cpp
! src/hotspot/share/gc/shenandoah/shenandoahPartialGC.cpp
! src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.cpp
! src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.hpp