[Bug bootstrap/78188] [7 Regression] AIX Bootstrap broken by tree-vrp.c change

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78188

--- Comment #22 from David Edelsohn <dje at gcc dot gnu.org> ---
There are two levels of set_comdat_group(). I am going to move the assert to
cgraph.h and try to find what else is setting comdat groups.

Do you want me to gate IPA comdat in the interim?