* dwarf2out.c (struct die_struct): Document that die_sib makes
a circular linked list.
(FOR_EACH_CHILD): New.
(reverse_die_lists): Delete.
(reverse_all_dies): Delete.
(add_dwarf_attr): Correct documentation.
(remove_child_with_prev): New.
(remove_child_TAG): Update for change to die_struct, use
remove_child_with_prev.
(add_child_die): Update for change to die_struct.
(splice_child_die): Use remove_child_with_prev and add_child_die.
(print_die): Use FOR_EACH_CHILD.
(die_checksum): Likewise.
(assign_symbol_names): Likewise.
(output_location_lists): Likewise.
(build_abbrev_table): Likewise.
(calc_die_sizes): Likewise.
(mark_dies): Likewise.
(unmark_dies): Likewise.
(unmark_all_dies): Likewise.
(output_die): Likewise.
(prune_unused_types_mark): Likewise.
(prune_unused_types_walk): Likewise.
(same_die_p): Update for change to die_struct.
(break_out_includes): Likewise.
(prune_unused_types_prune): Likewise.
(add_sibling_attributes): Use FOR_EACH_CHILD, simplify logic.
(prune_unmark_dies): Use FOR_EACH_CHILD, don't clear die_mark if
it's already clear.
(dwarf2out_finish): Don't call reverse_all_dies.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@113171 138bc75d-0d04-0410-961f-82ee72b054a4