parse.c (decode_statement): Suppress "Unclassifiable statement" error if previous error messages were emittes.

2019-01-01  Steven G. Kargl  <kargl@gcc.gnu.org>

	* parse.c (decode_statement):  Suppress "Unclassifiable statement"
	error if previous error messages were emittes.
 
2019-01-01  Steven G. Kargl  <kargl@gcc.gnu.org>
 
	* gfortran.dg/argument_checking_7.f90: Remove run-on error message.
	* gfortran.dg/dec_d_lines_3.f: Ditto.
	* gfortran.dg/dec_structure_24.f90: Ditto.
	* gfortran.dg/dec_structure_26.f90: Ditto.
	* gfortran.dg/dec_structure_27.f90: Ditto.
	* gfortran.dg/dec_type_print_3.f90: Ditto.
	* gfortran.dg/derived_name_1.f90: Ditto.
	* gfortran.dg/error_recovery_1.f90: Ditto.
	* gfortran.dg/gomp/pr29759.f90: Ditto.
	* gfortran.dg/pr36192.f90: Ditto.
	* gfortran.dg/pr56007.f90: Ditto.
	* gfortran.dg/pr56520.f90: Ditto.
	* gfortran.dg/pr78741.f90: Ditto.
	* gfortran.dg/print_fmt_2.f90: Ditto.
	* gfortran.dg/select_type_20.f90: Ditto.

From-SVN: r267526