[patch, fortran] Fix type conversion in large array constructors with iterators

[Thomas König]

Hello world,

the attached patch fixes the bug that Steve found; the patch itself
simply makes sure to copy a constructor instead of only the value
of the constructor when converting types.

Regressoin-tested. OK for trunk?

Maybe this is also a candidate for gcc-7, because of the silent
wrong-code issue.

Regards

	Thomas

2018-03-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/84931
         * simplify.c (gfc_convert_constant): Correctly handle iterators
         for type conversion.

2018-03-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/84931
         * gfortran.dg/array_constructor_52.f90: New test.
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