hg: shenandoah/jdk9/hotspot: UnlockDiagnosticVMOptions flag is needed for ShenandoahVerify

[zgu at redhat.com]

Changeset: 23eece597618
Author:    zgu
Date:      2017-08-09 15:44 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/23eece597618

UnlockDiagnosticVMOptions flag is needed for ShenandoahVerify

! test/gc/shenandoah/acceptance/HeapUncommit.java