[Patch, fortran] PR69498 ICE on unexpected Submodule

[Nicolas Koenig]

Hello everyone,

Dominique send me this patch written by Paul some time ago. For some 
reason it was never committed, so here we go :)

Ok for trunk?

Nicolas

Regression tested for x86_64-pc-linux-gnu.

Changelog:
2017-03-18  Nicolas Koenig  <koenigni@student.ethz.ch>
                 PR fortran/69498
                 * module.c (gfc_match_submodule): Add error
                 if function is called in the wrong state.

2017-03-18  Nicolas Koenig  <koenigni@student.ethz.ch>
                 PR fortran/69498
                 * gfortran.dg/submodule_unexp.f90: Modified test
                 to account for new error.


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