* gdbtypes.h (struct builtin_type): Add internal_fn member.

	* gdbtypes.h (struct builtin_type): Add internal_fn member.
	* gdbtypes.c (gdbtypes_post_init): Initialize it.
	* value.c (internal_fn_type): Remove.
	(_initialize_values): Do not initialize it.

	* value.c (struct internalvar): Add enum internalvar_kind type and
	kind member.  Restructure union internalvar_data type.  Remove type,
	canonical, and make_value members.
	(init_if_undefined_command): Update for data structure changes.
	(create_internalvar): Likewise.
	(create_internalvar_type_lazy): Likewise.
	(get_internalvar_integer): Likewise.
	(get_internalvar_function): Likewise.
	(set_internalvar_component): Likewise.
	(set_internalvar): Likewise.
	(set_internalvar_integer): Likewise.
	(set_internalvar_function): Likewise.
	(clear_internalvar): Likewise.
	(add_internal_function): Likewise.
	(preserve_one_internalvar): New function.
	(preserve_values): Call it.

	* value.h (value_of_internalvar): Add GDBARCH parameter.
	(internalvar_make_value): Likewise.
	* value.c (value_of_internalvar): Add GDBARCH parameter.  Pass it to
	make_value callback.  Use it to generate per-architecture result value
	types for internal variables with no pre-defined type.  Update for data
	structure changes.
	(show_convenience): Pass architecture to value_of_internalvar.
	* eval.c (evaluate_subexp_standard): Likewise.
	* infrun.c (siginfo_make_value): Add GDBARCH parameter.  Use it
	instead of current frame architecture.  Return per-architecture type.

	* value.h (set_internalvar_string): Add prototype.
	* value.c (set_internalvar_string): New function.
	* tracepoint.c (set_traceframe_context): Use it.