hg: shenandoah/jdk: Fix assert in ShenandoahTraversalGC

[roman at kennke.org]

Changeset: dd38f8445efd
Author:    rkennke
Date:      2018-06-26 19:24 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/dd38f8445efd

Fix assert in ShenandoahTraversalGC

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