[Bug tree-optimization/105705] [12/13 Regression] std::equal triggers incorrect -Wnonnull warning

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105705

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The warning seems to have started with r11-5391

Before that there was no warning even with -Wsystem-headers