[Bug rtl-optimization/95405] Unnecessary stores with std::optional

[gabravier at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95405

--- Comment #4 from Gabriel Ravier <gabravier at gmail dot com> ---
Ah, I see. Didn't think there was a constructor involved and/or that GIMPLE
would keep it implicit like this...