[Bug middle-end/82404] Unnecessary instructions in switch table

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82404

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Oh this has to be c++ because of enum class.  


So gcc just does not use the undefinedness here.