hg: jdk9/hs/hotspot: 8166862: CMS needs klass_or_null_acquire

[kim.barrett at oracle.com]

Changeset: 820e8a4db30d
Author:    kbarrett
Date:      2016-10-21 22:26 -0400
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/820e8a4db30d

8166862: CMS needs klass_or_null_acquire
Summary: Change CMS non-assert uses of klass_or_null to klass_or_null_acquire.
Reviewed-by: tschatzl, mgerdin

! src/share/vm/gc/cms/compactibleFreeListSpace.cpp
! src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp