hg: shenandoah/jdk9/hotspot: Implement heuristics to switch between merged and separate update-refs phase.

[roman at kennke.org]

Changeset: 6db19c2a2a18
Author:    rkennke
Date:      2017-05-08 22:29 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/6db19c2a2a18

Implement heuristics to switch between merged and separate update-refs phase.

! src/share/vm/gc/shenandoah/shenandoahBarrierSet.cpp
! src/share/vm/gc/shenandoah/shenandoahCollectorPolicy.cpp
! src/share/vm/gc/shenandoah/shenandoahCollectorPolicy.hpp
! src/share/vm/gc/shenandoah/shenandoahConcurrentThread.cpp
! src/share/vm/gc/shenandoah/shenandoah_globals.hpp