[patch, fortran] Fix PR 56342, matmul was not simplified

[Thomas Koenig]

Hello world,

the attached patch fixes the PR by calling gfc_simplify_expr for
parameter arrays, which do not yet appear to simplified completely
by the time they reach gfc_simplify_matmul.

I suspect this will also fix some more simplification issues, but I
didn't search for other cases.

Regression-tested.  OK for trunk?

Regards

	Thomas


2017-10-22  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/56342
         * simplify.c (is_constant_array_expr): If the expression is
         a parameter array, call gfc_simplify_expr.

2017-10-22  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/56342
         * gfortran.dg/matmul_const.f90: New test.
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