Merging calls to `abort'

[Eric Christopher]

> > Now, I wouldn't object to hacking GCC to avoid cross-jumping calls to
> > abort.  It's just that I don't think that the common GNU use of abort
> > serves the users.
> Agreed.  And as someone suggested, rather than treating abort
> specially within GCC, I think we'd be better off with a function
> attribute which prevented cross jumping to any function with
> the attribute set.

I think it makes sense to just not crossjump noreturn attribute
functions if we're going to do this.

-eric