PATCH: Update longlong.h from GCC 4.7.0

[Roland McGrath]

> The minimum GCC 4.3 required by glibc supports the ll variants of the
> builtins.  However, I don't know if longlong.h from GCC 4.7.0 will work
> with GCC 4.3, 4.4, 4.5 and 4.6 for all targets.  I am not sure if it is a
> good idea to do a wholesale update to GCC 4.7.0.

This is a file that we have normally kept as a verbatim copy from GCC,
not doing local modifications.  We really don't want to diverge unless
there is an unavoidable need to.

The diff to the current trunk looks safe to me, but Joseph should review it
too.


Thanks,
Roland