hg: shenandoah/jdk: Optimize traversal mark: constify, avoid polling traversal set and is_marked_next

[roman at kennke.org]

Changeset: e9cb9f7ae843
Author:    rkennke
Date:      2018-07-17 22:35 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/e9cb9f7ae843

Optimize traversal mark: constify, avoid polling traversal set and is_marked_next

! src/hotspot/share/gc/shenandoah/shenandoahOopClosures.hpp
! src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp
! src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.inline.hpp