[Bug tree-optimization/106922] [12 Regression] Bogus uninitialized warning on boost::optional<<std::vector<std::string>>>, missed FRE

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106922

--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
This addressed the other missed optimization (which isn't a regression), it
should make optimizing the m_initialized flag status more consistent.