hg: jdk9/hs/hotspot: 8166207: Use of Copy::conjoint_oops_atomic in global mark stack causes crashes on arm64

[thomas.schatzl at oracle.com]

Changeset: 9f7f714bf3e8
Author:    tschatzl
Date:      2016-09-19 22:55 +0200
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/9f7f714bf3e8

8166207: Use of Copy::conjoint_oops_atomic in global mark stack causes crashes on arm64
Summary: Use Copy::conjoint_memory_atomic() instead.
Reviewed-by: kbarrett

! src/share/vm/gc/g1/g1ConcurrentMark.cpp