hg: shenandoah/jdk10: Rewrite and fix ShenandoahHeap::marked_object_iterate

[ashipile at redhat.com]

Changeset: 0ad18dd4fe84
Author:    shade
Date:      2017-10-19 14:57 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/rev/0ad18dd4fe84

Rewrite and fix ShenandoahHeap::marked_object_iterate

! src/hotspot/share/gc/shenandoah/shenandoahHeap.inline.hpp
+ test/hotspot/jtreg/gc/shenandoah/acceptance/SieveObjects.java