[Bug fortran/68933] ICE when mixing "-fprofile-arcs -ftest-coverage" and "-fcoarray=lib" on gcc-6 only

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68933

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
GCC6 is no longer supported, this PR should probably closed as FIXED.