K 10
svn:author
V 7
rnoland
K 8
svn:date
V 27
2009-06-25T15:30:25.292203Z
K 7
svn:log
V 269
Additional vblank cleanups.

Use the vbl_lock when maniputlating the refcount.  Eventually I want to
convert this to use our internal refcount code.  Continue to use atomic
ops for manipulating vblank count since we access it often just for
reading.

MFC after:	3 days

END