[Bug c++/61414] enum class bitfield size-checking needs a separate warning flag controlling it

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414

--- Comment #30 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #29)
> Fixed for 8.4+ and 9.3+ too.

As far as I can tell, the commits in question just silenced the main false
positives from that warning that people were complaining about, they didn't
actually create a separate warning flag controlling the warning in question...
I still think that's worth doing anyways.