RFR(XS): 8150727: [JVMCI] add LoadLoad to the implicit memory barriers on AMD64

[Christian Thalinger]

I’m assuming this doesn’t change the generated code at all.  Does it reduce the number of nodes in compiler graphs?

> On Feb 26, 2016, at 4:47 AM, Roland Schatz <roland.schatz at oracle.com> wrote:
> 
> Hi,
> 
> Please review and integrate this small fix:
> http://cr.openjdk.java.net/~rschatz/JDK-8150727/webrev.00/ <http://cr.openjdk.java.net/~rschatz/JDK-8150727/webrev.00/>
> https://bugs.openjdk.java.net/browse/JDK-8150727 <https://bugs.openjdk.java.net/browse/JDK-8150727>
> 
> It was contributed by Benoit Daloze (cc'ed), and lgtm (but I'm not a reviewer myself).
> 
> Thanks,
> Roland

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