[Bug middle-end/111615] NULL check incorrectly skipped at O2 and O3

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111615

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't think this is a bug. memmem is defined such that a null pointer
argument is undefined even if the len is 0.