Add extra optimizations: -Ox

[Cosmin Truta]

On Fri, 9 Mar 2001, Joseph S. Myers wrote:

> > Fri  9 Mar 2001  Cosmin Truta <cosmint@cs.ubbcluj.ro>
> > 	* toplev.c, flags.h (optimize_extra): Define.
> > 	* toplev.c (main): When using the -Ox command-line option,
> > 	set optimize_extra and enable additional optimization flags.
> 
> This patch fails to include changes to invoke.texi to document the new
> flag.

That's because I wasn't sure whether you guys will incorporate it or not;
it was rather a suggestion than a patch.

After I will clarify the issue in the thread
"Re: -Os should default optimize to 2, without enforcing it"
with Geoff, I will modify the patch a bit, to make it consistent with how
-Os works. Then, I will resubmit the patch, and also the "invoke.texi"
patch.

Cosmin