fortran: use _P() defines from tree.h

fortran: use _P() defines from tree.h

gcc/fortran/ChangeLog:

	* trans-array.cc (is_pointer_array): Use _P() defines from tree.h.
	(gfc_conv_scalarized_array_ref): Ditto.
	(gfc_conv_array_ref): Ditto.
	* trans-decl.cc (gfc_finish_decl): Ditto.
	(gfc_get_symbol_decl): Ditto.
	* trans-expr.cc (gfc_trans_pointer_assignment): Ditto.
	(gfc_trans_arrayfunc_assign): Ditto.
	(gfc_trans_assignment_1): Ditto.
	* trans-intrinsic.cc (gfc_conv_intrinsic_minmax): Ditto.
	(conv_intrinsic_ieee_value): Ditto.
	* trans-io.cc (gfc_convert_array_to_string): Ditto.
	* trans-openmp.cc (gfc_omp_is_optional_argument): Ditto.
	(gfc_trans_omp_clauses): Ditto.
	* trans-stmt.cc (gfc_conv_label_variable): Ditto.
	* trans.cc (gfc_build_addr_expr): Ditto.
	(get_array_span): Ditto.