[Bug fortran/52846] [F2008] Support submodules

[sfilippone at uniroma2 dot it]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52846

--- Comment #11 from Salvatore Filippone <sfilippone at uniroma2 dot it> ---
Created attachment 35995
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35995&action=edit
test case