Fortran] PR84135 fix merging dimension into codimension array spec

        Backported from mainline
        2020-01-09  Tobias Burnus  <tobias@codesourcery.com>

        PR fortran/84135
        * array.c (gfc_set_array_spec): Fix shifting of codimensions
        when adding a dimension.
        * decl.c (merge_array_spec): Ditto. Fix using correct codimensions.


        Backported from mainline
        2020-01-09  Tobias Burnus  <tobias@codesourcery.com>

        PR fortran/84135
        * gfortran.dg/coarray/codimension_3.f90: New.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-9-branch@280110 138bc75d-0d04-0410-961f-82ee72b054a4