[Bug middle-end/67338] fold-const sanitizer runtime error in roundup_loc

[zeccav at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67338

--- Comment #1 from Vittorio Zecca <zeccav at gmail dot com> ---
Still in 7.0.1

../../gcc-7-246252/gcc/fold-const.c:14253:11: runtime error: negation of
-2147483648 cannot be represented in type 'int'; cast to an unsigned type to
negate this value to itself