[Bug c/78768] -Walloca-larger-than and -Wformat-length warnings disabled by -flto

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78768

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This testcase fails on aarch64-linux-gnu.