hg: shenandoah/jdk9/hotspot: Correct prefetch offset for marked object iteration.

[ashipile at redhat.com]

Changeset: 1be7a284a52f
Author:    shade
Date:      2017-04-17 18:24 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/1be7a284a52f

Correct prefetch offset for marked object iteration.

! src/share/vm/gc/shenandoah/shenandoahHeap.inline.hpp