hg: jdk/jdk: 8224508: Shenandoah: Need to update thread roots in final mark for piggyback ref update cycle

[zgu at redhat.com]

Changeset: 0b56fc0448ec
Author:    zgu
Date:      2019-05-22 07:12 -0400
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/0b56fc0448ec

8224508: Shenandoah: Need to update thread roots in final mark for piggyback ref update cycle
Reviewed-by: shade, rkennke

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