https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89762
--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> --- The patch can't be backported since it depends on the rest of type simplification infrastructure that is GCC 9 only. I will take a look why registration fails - it looks like the patch above only works around the issue anyway. Honza
