[Bug c/80097] internal compiler error in c_fully_fold_internal with std=c89 and -fsanitize=float-divide-by-zero

[max at maxbruckner dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80097

--- Comment #2 from Max Bruckner <max at maxbruckner dot de> ---
I already created a bug report in the Archlinux bug tracker here:
https://bugs.archlinux.org/task/53368 but I could also reproduce the bug on
Ubuntu 16.04.2 with GCC 5.4.0