Do a refactoring in linemap (PR preprocessor/90382).

Do a refactoring in linemap (PR preprocessor/90382).

2019-05-14  Martin Liska  <mliska@suse.cz>

	PR preprocessor/90382
	* include/line-map.h (get_data_from_adhoc_loc): Add const to
	the first argument.
	(get_location_from_adhoc_loc): Likewise.
	* line-map.c(get_data_from_adhoc_loc):  Add const to
	the first argument.
	(get_location_from_adhoc_loc): Likewise.
	(get_combined_adhoc_loc): Use get_location_from_adhoc_loc
	(or get_data_from_adhoc_loc).
	(get_range_from_adhoc_loc): Likewise.
	(get_pure_location): Likewise.
	(linemap_position_for_loc_and_offset): Likewise.
	(linemap_lookup): Likewise.
	(linemap_ordinary_map_lookup): Likewise.
	(linemap_macro_map_lookup): Likewise.
	(linemap_get_expansion_line): Likewise.
	(linemap_get_expansion_filename): Likewise.
	(linemap_location_in_system_header_p): Likewise.
	(linemap_location_from_macro_expansion_p): Likewise.
	(linemap_macro_loc_to_exp_point): Likewise.
	(linemap_resolve_location): Likewise.
	(linemap_unwind_toward_expansion): Likewise.
	(linemap_unwind_to_first_non_reserved_loc): Likewise.
	(linemap_expand_location): Likewise.
	(linemap_dump_location): Likewise.

From-SVN: r271162