[Bug tree-optimization/90303] [9/10 Regression] ICE in hash_odr_name with fastcall attribute starting with r267359

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90303

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
No, TYPE_CANONICAL (TYPE_MAIN_VARIANT (type)) is also NULL, for the same
reasons.
It is a template instantiation with a template parameter that needs structural
equality.