aio_mlock(2) system call

[Gleb Smirnoff]

  Hello!

  This patch brings a new system call - aio_mlock(2). The idea is
quite clear from its name: it performs mlock(2), which can take
a long time if pages aren't resident, under aio(4) control.

  The patch is quite simple, and non-desctructive. Here it is
for your review.

  If no one objects, I'd like to add it to FreeBSD 10.

-- 
Totus tuus, Glebius.
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