[Bug target/91851] [m68k] Convert the backend to MODE_CC so it can be kept in future releases

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91851

--- Comment #6 from Tobias Burnus <burnus at gcc dot gnu.org> ---
A seemingly independent conversation to ccmode + lra has been posted by Coerl
[I don't know whether he has a FSF copyright assignment] at
https://gcc.gnu.org/ml/gcc-patches/2019-11/msg02131.html