* breakpoint.c (update_watchpoint): Skip creating locations and

	* breakpoint.c (update_watchpoint): Skip creating locations and
	reading the selected frame if there's no execution.
	(bpstat_stop_status): Use is_hardware_watchpoint.  If not
	stopping, update watchpoints and the global location list, instead
	of removing and inserting all breakpoints.
	(breakpoint_address_is_meaningful): Hardware watchpoints also have
	a meaningful target address.
	(watchpoint_locations_match): New.
	(breakpoint_locations_match): New.
	(watch_command_1): Create the watchpoint breakpoint without any
	location initially.  Use update_watchpoint to create the
	watchpoint locations.
	(update_global_location_list): Use breakpoint_locations_match, so
	watchpoint locations are handled too.  Also detect duplicate
	watchpoint locations.