[Patch, fortran, RFC] Add warning for missing location information

[Thomas Koenig]

> the attached patch runs through gfortran's AST to check for missing
> location information.

... this time with attachment.

2016-11-14  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/78226
         * error.c (gfc_warning_internal):  New function.
         * frontend-passes.c (CHECK_LOCUS):  New macro.
         (gfc_run_passes):  Call check_locus if CHECK_LOCUS
         is defined.
         (check_locus_code):  New function.
         (check_locus_expr):  New function.
         (check_locus):  New function.
         * gfortran.h:  Add prototype for gfc_warning_internal.


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