K 10
svn:author
V 7
attilio
K 8
svn:date
V 27
2011-12-06T22:57:48.753853Z
K 7
svn:log
V 300
Use atomics for rn_count on leaf node because RED operations happen
without the VM_OBJECT_LOCK held, thus can be concurrent with BLACK ones.
However, also use a write memory barrier in order to not reorder the
operation of decrementing rn_count in respect fetching the pointer.

Discussed with:	jeff

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