Removal of kern_xxx() no-at variants.

[Benjamin Kaduk]

On Wed, 12 Nov 2014, John Baldwin wrote:

> On Wednesday, November 12, 2014 8:24:52 am Konstantin Belousov wrote:
> > We have 'fat' KPI for kern_open() and other vfs syscall helpers, after
> > the at-version of the syscalls was added somewhere at 8-CURRENT.
> > For instance, we provide
> > 	kern_open() and kern_openat().
> > But more, we provide
> > 	kern_stat()
> > 	kern_lstat()
> > 	kern_statat()
> > 	kern_statat_vhook()
> > first three being a trivial wrapper around kern_statat_vhook().
> > More, existence of two or (sometimes) three layers around basic
> > syscall helper causes issues like r271655 making the argument
> > validation split.
> >
> > Kepping the compat layer was reasonable in 8-CURRENT time when the
> > at variants were experimental and patch to add the syscalls was
> > already large and error-prone.  Now, I think we should shave the
> > extra call indirections, it costs nothing at callers and sometimes
> > even improves the code.
>
> The idea sounds fine to me.  Note that I only did a glance over the diff
> rather than a thorough review.

Please do bump __FreeBSD_version along with the change.

-Ben