* mi/mi-cmds.h (mi_cmd_stack_list_variables): Declare.

	* mi/mi-cmds.h (mi_cmd_stack_list_variables): Declare.
	* mi/mi-cmds.c (mi_cmds): Register -stack-list-variables.
	* mi/mi-cmd-stack.c (enum what_to_list): New.
	(list_args_or_locals): Accept what_to_list parameter.
	Use 'variables' as output name of all are requested.
	(mi_cmd_stack_list_variables): New.
	(mi_cmd_stack_list_locals, mi_cmd_stack_list_args): Adjust.