hg: shenandoah/jdk9/hotspot: "Allocation failure" cause should not be overwritten

[ashipile at redhat.com]

Changeset: b67661c7315a
Author:    shade
Date:      2017-05-24 10:41 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/b67661c7315a

"Allocation failure" cause should not be overwritten

! src/share/vm/gc/shenandoah/shenandoahConcurrentThread.cpp