[Bug tree-optimization/118657] Missed optimization (unreachable branch could be pruned after taking into account the possible values of a constexpr lookup table)

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118657

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 60281
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60281&action=edit
reduced and made into a C testcase