[aarch64-port-dev ] Redundant DMB Instructions in JDK8u

[Daniel Stewart]

Redundant DMB instructions can sometimes be emitted by JDK8u. There was a
patch for this in JDK9, and this is simply a backport of that patch to
JDK8u.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8139041

The following webrev contributed by Daniel Stewart (daniel.stewart at
linaro.org), but is a backport of a patch by Andrew Haley, can resolve it.

Webrev:
http://people.linaro.org/~daniel.stewart/webrev/

I'd appreciate any help in reviewing it.

Thanks,
Daniel

-- 
Daniel Stewart
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