[Bug tree-optimization/117764] [15 Regression] cddce should handle __builtin_unreachable guards

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117764

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
We will most likely have a similar issue with assume attribute too.