Re: [pr/63582] Don't even store __int128 types if not supported.

[DJ Delorie]

> > Fixed PR/63582.  Tested with no regressions on x86-64 and ix86.  Ok?
> > 
> >     * tree.c (build_common_tree_nodes): Don't even store the
> >     __int128 types if they're not supported.
> 
> OK.

Thanks!  Committed.