hg: shenandoah/jdk9/hotspot: Superfluous conc GC cancellation when cset is empty. Cancelling GC here makes conc mark permanently cancelled.

[ashipile at redhat.com]

Changeset: f4e026046090
Author:    shade
Date:      2016-11-24 18:16 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/f4e026046090

Superfluous conc GC cancellation when cset is empty. Cancelling GC here makes conc mark permanently cancelled.

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