[Bug bootstrap/82831] [8 Regression] Broken PGO bootstrap after r254379

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82831

--- Comment #27 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
I would still suggest here going with Martin's patch: it is incorrect to
attempt to change the partition after BB order has been fixed.  We can
incrementally deal with the missed optimization in this quite rare scenario
that code duplication makes it possible to transfer BB from hot to cold
partition. Given it happens only sometimes during full bootstrap, I am not sure
it is worth the effort.