With JDK-8325269 I pasted a JMH inline that showed a DMB related issue. Now with JDK-8354572 it has been useful again so it seems useful to add it into the repo.
            
- relates to
- 
                    JDK-8325269 Quadruple dmbs could be emitted after JDK-8324186 -           
- Closed
 
-         
- 
                    JDK-8354572 Turn off AlwaysMergeDMB for Ampere CPU by default -           
- Resolved
 
-         
- links to
- 
                     Commit(master)
        openjdk/jdk/239760ac Commit(master)
        openjdk/jdk/239760ac
- 
                     Review(master)
        openjdk/jdk/24783 Review(master)
        openjdk/jdk/24783