hg: shenandoah/jdk8u/hotspot: Fix build error in release config.

[ashipile at redhat.com]

Changeset: fe583d4e28de
Author:    shade
Date:      2017-09-14 11:42 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/fe583d4e28de

Fix build error in release config.

! src/share/vm/gc_implementation/shenandoah/shenandoahHeap.cpp