[Bug c++/70029] [8 Regression] ICE with C++11 and -flto

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70029

--- Comment #13 from Jason Merrill <jason at gcc dot gnu.org> ---
I believe r241831 fixed the actual problem that verify_type was catching.  This
still fails because free_lang_data_in_type clears TYPE_LANG_FLAG_4 on 't' but
not 'ct'.  Should something have added TYPE_CANONICAL to fld.types?