hg: shenandoah/jdk: Traversal evac assist should poll "next" marking context

[ashipile at redhat.com]

Changeset: a362075d9bfe
Author:    shade
Date:      2018-08-14 13:59 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/a362075d9bfe

Traversal evac assist should poll "next" marking context

! src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.cpp