[Bug sanitizer/79562] sanitizer breaks bootstrap of x86_64-*-freebsd

[kargl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79562

--- Comment #2 from kargl at gcc dot gnu.org ---
The problem was introduced within the last 8 days.  My last
bootstrap was 

% gfc7 --version
GNU Fortran (GCC) 7.0.1 20170207 (experimental)