hg: jdk/sandbox: 8236681: Shenandoah: Disable concurrent class unloading flag if no class unloading for the GC cycle

[chris.hegarty at oracle.com]

Changeset: 44cb1f517839
Author:    zgu
Date:      2020-01-07 08:53 -0500
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/44cb1f517839

8236681: Shenandoah: Disable concurrent class unloading flag if no class unloading for the GC cycle
Reviewed-by: rkennke

! src/hotspot/share/gc/shenandoah/shenandoahConcurrentRoots.cpp