PR fortran/30877

	* fortran/interface.c (check_operator_interface): Implement
	the standard checks on user operators extending intrinsic operators.
	* fortran/resolve.c (resolve_operator): If the ranks of operators
	don't match, don't error out but try the user-defined ones first.

	* gfortran.dg/operator_1.f90: New test.
	* gfortran.dg/operator_2.f90: New test.

From-SVN: r123196