[wwwdocs] Add -mpc* options to 4.3 Changes?

[Uros Bizjak]

Hello!

> > As a user I think it would be helpful to add the new -mpc* set of 
> > options to the 4.3 Changes web page. I didn't realize these were 
> > available until someone mentioned them on gcc@gcc.gnu.org recently.
> > 
> > Perhaps something along the lines of the below (or whatever Uros etc 
> > thinks)?
>
> Looks good to me!  Thanks for reminding us to document this and even
> coming up with a patch.
>
> Uros, if you agree go ahead and commit the patch, or let me know and
> I can commit it as well.

Thanks, the patch with a small addition ("... x87 floating point 
precision." ) was just committed to wwwdocs.

Thanks,
Uros.