[patch, fortran] Fix PR 79795

[Thomas Koenig]

Hello world,

the attached patch fixes a regression by turning an ICE-on-invalid into
an error message (and making sure that it fits).

Regression-tested on trunk.

OK for all affected branches (8/7/6)?

Regards

	Thomas

2017-10-15  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/79795
         * resolve.c (resovle_symbol): Change gcc_assert to
         sensible error message.

2017-10-15  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/79795
         * gfortran.dg/assumed_size_2.f90: New test.
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