* dwarf2read.c (stmt_list_hash): New struct.

	* dwarf2read.c (stmt_list_hash): New struct.
	(type_unit_group): Embed "per_cu" member, remove pointer.
	New union member "t", move member "tus" into it, all uses updated.
	New member "hash", replaces member "line_offset, all uses updated.
	(quick_file_names): Replace member "offset" with "hash", all uses
	updated.
	(hash_stmt_list_entry, eq_stmt_list_entry): New functions.
	(hash_file_name_entry, eq_file_name_entry): Call them.
	(hash_type_unit_group, eq_type_unit_group): Ditto.
	(dw2_get_cu, dw2_get_primary_cu): Replace assert with a better one.
	(dw2_get_file_names_reader): Fix file name table calculation for TUs.
	(dw2_get_file_names): Update.
	(create_type_unit_group): Replace "per_cu" arg with "cu".
	All callers updated.  Fix "quick" (.gdb_index) handling.
	(get_type_unit_group): Replace "per_cu" arg with "cu".
	All callers updated.
	(build_type_unit_groups): Don't reset tu_stats.