hg: jdk/submit: 8230392: Define AArch64 as MULTI_COPY_ATOMIC

[aph at redhat.com]

Changeset: ad9548e8086b
Author:    aph
Date:      2020-01-23 11:44 -0500
URL:       https://hg.openjdk.java.net/jdk/submit/rev/ad9548e8086b

8230392: Define AArch64 as MULTI_COPY_ATOMIC
Reviewed-by: adinn, dholmes

! src/hotspot/cpu/aarch64/globalDefinitions_aarch64.hpp
! src/hotspot/share/gc/shared/taskqueue.inline.hpp