[patch, fortran] Fix PR 85102

[Thomas Koenig]

Hello world,

this is a minimal-invasive patch to fix the case where array
specs starting with a parenthesis were not handled correctly.

Regression-tested. OK for trunk?

Regards

	Thomas

2018-04-01  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/85102
         * array.c (strip_parens): New function.
         (match_array_element_spec): Use it to strip away parentheses
         from array bounds.

2018-04-01  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/85102
         * gfortran.dg/array_simplify_2.f90: New test.
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