* dwarf2read.c (struct dwarf2_cu): Remove ranges_offset and

	* dwarf2read.c (struct dwarf2_cu): Remove ranges_offset and
	has_ranges_offset.
	(struct partial_die_info): Remove language, has_stmt_list, dirname,
	and line_offset.
	(dwarf2_build_include_psymtabs): Take a die_info.  Handle a missing
	line table.
	(dwarf2_get_pc_bounds): Take PST argument.  Pass it
	to dwarf2_ranges_read.  Update all callers.
	(init_cu_die_reader): Move earlier.
	(dwarf2_find_base_address): New function.
	(process_psymtab_comp_unit): Rewrite to use a full DIE for the
	compilation unit.  Use dwarf2_get_pc_bounds and
	dwarf2_find_base_address.
	(load_comp_unit): Rewrite to use a full DIE for the compilation unit.
	(process_full_comp_unit): Use dwarf2_find_base_address.
	(read_partial_die): Remove support for attributes only used
	in the compilation unit DIE.
	* symfile.c (allocate_psymtab): Make FILENAME const.
	(start_psymtab_common): Likewise.
	* symfile.h (allocate_psymtab, start_psymtab_common): Update
	prototypes.