[Bug target/92729] [avr] Convert the backend to MODE_CC so it can be kept in future releases

[abebeos at lazaridis dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92729

--- Comment #41 from abebeos at lazaridis dot com ---
[RFC] [avr] Toolchain Integration for Testsuite Execution (avr cc0 to mode_cc0
conversion)

https://gcc.gnu.org/pipermail/gcc-patches/2020-December/561427.html