Tile changes

[Chris Metcalf]

If the private branches are merged, then the glibc tip will build for
Tilera (in addition to a few changes I'll need to follow up with in
libc-ports).

Ideally, it would also be good to update config.guess and config.sub from
the latest upstream version.  Is there a standard process for that, or
should I just go grab the latest and put them in a private branch to merge
like I did for the other tile specific changes?

And, Joseph Myers mentioned we could merge these changes to 2.15.  I'm
hopeful we can do that, but I don't know who would own the process for
that.  (Again, presumably after I commit the necessary follow-up changes in
libc-ports.)

Many thanks!

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com