* dwarf2read.c (REF_HASH_SIZE): Delete.

	* dwarf2read.c (REF_HASH_SIZE): Delete.
	(struct dwarf2_cu): Replace die_ref_table with die_hash.
	(struct die_info): Remove next_ref.
	(store_in_ref_table): Remove offset argument.  Rewrite to use
	htab_find_slot_with_hash.
	(die_hash, die_eq): New.
	(read_comp_unit): Allocate the die_hash.
	(read_die_and_children): Update call to store_die_ref.
	(follow_die_ref): Rewrite to use htab_find_with_hash.