[Bug sanitizer/82072] sanitizer does not detect an overflow from LLONG_MIN

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82072

--- Comment #15 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I'm not sure if it even makes a difference, but I've added the check.