git: openjdk/mobile: 8243326: Cleanup use of volatile in taskqueue code

[duke]

Changeset: 478773c1
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2020-04-14 02:25:19 +0000
URL:       https://git.openjdk.java.net/mobile/commit/478773c1

8243326: Cleanup use of volatile in taskqueue code

Removed volatile on queue elements, cleaned up other uses, made atomics explicit.

Reviewed-by: tschatzl, iwalulya

! src/hotspot/share/gc/g1/g1ConcurrentMark.hpp
! src/hotspot/share/gc/shared/taskqueue.hpp
! src/hotspot/share/gc/shared/taskqueue.inline.hpp