[Bug fortran/66762] ICE when compiling gfortran.dg/submodule_[16].f90 with -flto

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66762

--- Comment #11 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> The attached patch fixes the problem but is, as yet, not regtested.

Confirmed and regtested without regression. Thanks.