[Bug fortran/80304] [7 Regression] do-concurrent dosn't work well with gfortran 7.

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80304

--- Comment #7 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Fun fact: -flto also fixes it.