Removing Selective Scheduling
Selective scheduling is only turned on by ia64 by default. There are many issues with it: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85099 . It also "modifies" the cfghooks for create_basic_block (and also sets sched_split_block). (See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117871).
Even though selective scheduling has maintainers there has been only one fix (PR112995) in the last 6 years.