2007-05-04  Josh Conner  <jconner@apple.com>

	* basic-block.h (cdi_direction): Assign values to all enumeration
	constants.
	(dom_computed): Remove.
	(dom_info_state): New.
	(set_dom_info_availability): New.
	* tree-ssa-loop-im.c (determine_invariantness): Initialize
	walk_data.dom_direction.
	* cfghooks.c (delete_basic_block): Use dom_info_available_p()
	instead of dom_computed[].
	(split_edge): Likewise.
	(create_basic_block): Likewise.
	(merge_blocks): Likewise.
	* ifcvt.c (find_if_header): Likewise.
	* tree-cfgcleanup.c (cleanup_tree_cfg): Likewise.
	* tree-ssa-dce.c (remove_dead_stmt): Likewise.
	* tree-ssa.c (verify_ssa): Likewise.
	* tree-cfg.c (tree_verify_flow_info): Likewise.
	(remove_edge_and_dominated_blocks): Likewise.
	* dominance.c (dom_computed): Make static.
	(calc_dfs_tree_nonrec): Change third param to a bool.
	(calc_dfs_tree): Change second param to a bool.
	(calc_idioms): Change second param to a bool.  Use
	dom_convert_dir_to_idx.
	(init_dom_info): Validate dir before using.
	(dom_convert_dir_to_idx): New.
	(calculate_dominance_info): Use dom_convert_dir_to_idx.  New
	variable 'reverse' used for calling calc_dfs_tree and calc_idoms.
	(free_dominance_info): Use dom_convert_dir_to_idx.
	(get_immediate_dominator): Likewise.
	(set_immediate_dominator): Likewise.
	(get_dominated_by): Likewise.
	(redirect_immediate_dominators): Likewise.
	(nearest_common_denominator): Likewise.
	(dominated_by_p): Likewise.
	(bb_dom_dfs_in): Likewise.
	(bb_dom_dfs_out): Likewise.
	(recount_dominator): Likewise.
	(iterate_fix_dominators): Likewise.
	(add_to_dominance_info): Likewise.
	(delete_from_dominance_info): Likewise.
	(first_dom_son): Likewise.
	(next_dom_son): Likewise.
	(dom_info_available_p): Likewise.
	(dom_info_state): New.
	(set_dom_info_availability): New.

From-SVN: r124439