Augment stringification of trees.

Augment stringification of trees.

	* cp-tree.h (tree_string_flags): New error stringifying enumeration.
	(fndecl_as_string, type_as_string_real, args_as_string,
	code_as_string, language_as_string, parm_as_string,
	op_as_string, assop_as_string, cv_as_string): Remove.
	(type_as_string, decl_as_string, expr_as_string): Adjust prototype.
	(context_as_string): Declare new function.
	* error.c (cp_printers): Move definition.
	(OB_UNPUT): Remove.
	(OB_END_TEMPLATE_ID): Adjust.
	(interesting_scope_p): Remove.
	(dump_scope): New static function.
	(dump_qualifiers): Adjust prototype, reimplement.
	(dump_template_value): Use tree_string_flags.
	(dump_type_real): Move back to dump_type.
	(dump_type): Adjust prototype. Use tree_string_flags.
	(dump_aggr_type): Likewise. Use dump_template_parms.
	(dump_type_prefix): Adjust prototype. Use tree_string_flags. Return pad flag.
	(dump_type_suffix): Adjust prototype. Use tree_string_flags.
	(dump_simple_decl): Likewise.
	(dump_decl): Likewise. Use dump_template_decl.
	(dump_template_decl): New static function broken out of dump_decl.
	(dump_function_decl): Adjust prototype. Use tree_string_flags.
	(dump_parameters): Likewise. Prefix space.
	(dump_exception_spec): Adjust prototype. Use tree_string_flags.
	(dump_function_name): Likewise. Use dump_template_parms.
	(dump_template_parms): New static function broken out of
	dump_function_name.
	(dump_expr_list): Adjust prototype. Use tree_string_flags.
	(dump_expr): Likewise.
	(fndecl_as_string): Removed
	(type_as_string_real): Removed
	(dump_binary_op): Adjust prototype. Use tree_string_flags.
	(dump_unary_op): Likewise.
	(type_as_string): Likewise.
	(expr_as_string): Likewise.
	(decl_as_string): Likewise.
	(context_as_string): New function.
	(lang_decl_name): Adjust.
	(decl_to_string): New static print callback.
	(expr_to_string): Likewise.
	(fndecl_to_string): Likewise.
	(code_as_string): Renamed to ...
	(code_to_string): ... here. Adjust.
	(language_as_string): Renamed to ...
	(language_to_string): ... here. Adjust.
	(parm_as_string): Renamed to ...
	(parm_to_string): ... here.
	(op_as_string): Renamed to ...
	(op_to_string): ... here.
	(assop_as_string): Renamed to ...
	(assop_to_string): ... here.
	(type_to_string): New static print callback.
	(args_as_string): Renamed to ...
	(args_to_string): ... here. Adjust.
	(cv_as_string): Renamed to ...
	(cv_to_string): ... here. Adjust.
	* pt.c (mangle_class_name_for_template): Use tree_string_flags.
	(print_template_context): Likewise.

From-SVN: r29673