[Bug other/63440] -Og does enable -fmerge-constants too

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63440

--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #3)
> (In reply to Richard Biener from comment #1)
> > Note that the various "Enabled at levels ..." were not updated for -Og.
> 
> This part is bug 59658.

...which Sandra has since fixed.