[Bug c/68022] -O2 breaks computed signed integer comparison for AVR

[tom at tommay dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68022

--- Comment #1 from Tom May <tom at tommay dot net> ---
Created attachment 36542
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36542&action=edit
avr-gcc -v output