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

[Roland Schatz]

Hi,

Please review and integrate this small fix:
http://cr.openjdk.java.net/~rschatz/JDK-8150727/webrev.00/
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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