PR gdb/8869:

	PR gdb/8869:
	* language.c (language_completer): New function.
	(range_or_type_completer): New function.
	(case_completer): New function.
	(_initialize_language): Set completers.
	* cli/cli-decode.c (add_setshow_string_cmd): Return the "set"
	command.
	(add_setshow_string_noescape_cmd): Likewise.
	(add_setshow_integer_cmd): Likewise.
	(add_setshow_uinteger_cmd): Likewise.
	(add_setshow_zinteger_cmd): Likewise.
	(add_setshow_zuinteger_cmd): Likewise.
	* command.h (add_setshow_string_cmd,
	add_setshow_string_noescape_cmd, add_setshow_uinteger_cmd,
	add_setshow_zinteger_cmd, add_setshow_zuinteger_cmd): Update.