[Bug c/83955] false positive implicit-fallthrough warning on switch enum

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83955

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The warning is correct for c.  The enum type is really an int in size and
space.  That is assigning 3 or 4 to it is still well defined code.