* diagnostic.h (struct diagnostic_context): Add new field.
	(lang_diagnostic_starter, lang_diagnostic_finalizer): Remove
	declaratons.
	(global_dc): Declare.
	* diagnostic.c (global_diagnostic_context): New variable.
	(global_output_buffer): Remove.
	(global_dc): Define.
	(lang_diagnostic_starter, lang_diagnostic_finalizer): Remove
 	definitions.
	(initialize_diagnostics): Adjust initialization.
	(set_diagnostic_context): Adjust setting.

cp/

	* error.c (init_error): Adjust settings.

From-SVN: r43581