[Bug c++/116459] gcc 12.2.0 optimized out functions which has observable side affect

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116459

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Regression started with with r12-2523 and was fixed by r13-7206, which was
backported as r12-9476.

So this is a dup of either PR ipa/107769 or PR ipa/109318.