[PATCH] Linux: Add membarrier system call wrapper

[Florian Weimer]

The documentation part of this patch was circulated off-list previously. 
  The text received some positive feedback, some criticism, but no one 
proposed an alternative wording.

Due to lack of consensus, we could add the system call without 
documentation.  I do not think the documentation issue should block 
acceptance of the system call wrapper.

Thanks,
Florian
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