[Bug target/106827] operator++ doesn't work for enum -O2 -mcpu=cortex-m0plus

[bugzilla--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106827

--- Comment #1 from Kio <bugzi...@little-bat.de> ---
updated link at godbolt:

https://godbolt.org/z/5sf7cr9c3