git: openjdk/jdk: 8254672: ZGC: ZParallelOopsDo/ZSerialWeakOopsDo should use atomic load/store

[Per Liden]

Changeset: 02d9c291
Author:    Per Liden <pliden at openjdk.org>
Date:      2020-10-13 15:36:23 +0000
URL:       https://git.openjdk.java.net/jdk/commit/02d9c291

8254672: ZGC: ZParallelOopsDo/ZSerialWeakOopsDo should use atomic load/store

Reviewed-by: stefank

! src/hotspot/share/gc/z/zRootsIterator.cpp