[11u] RFR 8265677: CMS: CardTableBarrierSet::write_ref_array_work() lacks storestore barrier

[Reingruber, Richard]

// Resend after removing incorrect link 

Hi,

please review this XXS fix for 11u which adds a storestore barrier to
`CardTableBarrierSet::write_ref_array_work(MemRegion mr)`. The barrier is only
executed if CMS is selected. Please refer to the bug report for more details.
 
Bug:
  https://bugs.openjdk.java.net/browse/JDK-8265677

11u webrev:
  http://cr.openjdk.java.net/~rrich/webrevs/8265677_11u_CMS__CardTableBarrierSet__write_ref_array_work___lacks_storestore_barrier/webrev.0/
 
Testing:

make run-test-tier1 JTREG="VM_OPTIONS=-XX:+UseConcMarkSweepGC"

CI testing @SAP: JCK and JTREG, also in Xcomp mode, SPECjvm2008, SPECjbb2015, Renaissance Suite,
SAP specific tests with fastdebug and release builds on all platforms
 
Thanks, Richard.