git: openjdk/mobile: 8244551: Shenandoah: Fix racy update of update_watermark

[duke]

Changeset: 62bf2d07
Author:    Roman Kennke <rkennke at openjdk.org>
Date:      2020-05-07 08:00:30 +0000
URL:       https://git.openjdk.java.net/mobile/commit/62bf2d07

8244551: Shenandoah: Fix racy update of update_watermark

Reviewed-by: shade

! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.hpp
! src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.inline.hpp