[aarch64-port-dev ] Request for Approval: Backport patches to fix volatile access inconsistency

[Yangfei (Felix)]

> Felix, do you have anyone on the hook for actually pushing these to jdk11u-dev? If not, I can push.
> 
>     fyang: I cannot access my laptop for now.  Please help do the push.  

Passed tier1 on aarch64 and x86_64. Pushed all three to jdk11u-dev:
  https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/4f787d0086fc
  https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/4cf59897e14f
  https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/04dd2501a9df

  Thanks for the help.  Patches for 8u aarch64 repo also pushed: 
  https://mail.openjdk.java.net/pipermail/aarch64-port-dev/2019-August/007938.html

Felix