[PATCH] Fortran : ICE in gfc_find_array_ref(): No ref found PR95981

[Mark Eggleston]

Please find attached a patch to fix PR95981.  Original patch by Steve Kargl.

OK to commit and backport?

Commit message:

Fortran  :  ICE in gfc_find_array_ref(): No ref found PR95981

When looking for an array reference allow NULL references.  If
no array reference is found dim_rank_check should return false.

2020-07-01  Steven G. Kargl  <kargl@gcc.gnu.org>

gcc/fortran/

     PR fortran/95981
     * check.c (dim_rank_check): Allow NULL references in call to
     gfc_find_array_ref and return false if no reference is found.

2020-07-01  Mark Eggleston <markeggleston@gcc.gnu.org>

gcc/testsuite/

     PR fortran/95981
     * gfortran.dg/pr95981.f90: New test.

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