hg: jdk/sandbox: 8243238: Shenandoah: explicit GC request should wait for a complete GC cycle

[chris.hegarty at oracle.com]

Changeset: 51684b9281da
Author:    shade
Date:      2020-04-21 11:20 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/51684b9281da

8243238: Shenandoah: explicit GC request should wait for a complete GC cycle
Reviewed-by: rkennke

! src/hotspot/share/gc/shenandoah/shenandoahControlThread.cpp
! src/hotspot/share/gc/shenandoah/shenandoahControlThread.hpp