* basic-block.h (struct basic_block_def): New field loop_father.
	(BB_VISITED): New flag.
	(struct loop): New field pred, removed field shared.
	(struct loops): New field parray.
	(LOOP_EXITS_DOMS): Removed.
	(flow_loop_tree_node_add, flow_loop_tree_node_remove,
	flow_loop_nested_p, flow_bb_inside_loop_p, get_loop_body,
	dfs_enumerate_from, loop_preheader_edge, loop_latch_edge,
	add_bb_to_loop, remove_bb_from_loops, find_common_loop,
	verify_loop_structure): Declare.
	* cfg.c (entry_exit_blocks): Initialize loop_father field.
	* cfganal.c (dfs_enumerate_from): New function.
	* cfgloop.c (HEAVY_EDGE_RATIO): New constant.
	(flow_loop_entry_edges_find, flow_loop_exit_edges_find,
	flow_loop_nodes_find, flow_loop_level_compute, flow_loop_nested_p,
	flow_loop_dump, flow_loops_dump, flow_loops_free,
	flow_loop_tree_node_add, flow_loop_level_compute,
	flow_loops_level_compute, flow_loop_scan, flow_loops_update,
	flow_loop_outside_edge_p): Modified for new infrastructure.
	(make_forwarder_block, canonicalize_loop_headers, glb_enum_p,
	redirect_edge_with_latch_update, flow_loop_free): New static functions.
	(flow_loop_tree_node_remove, flow_bb_inside_loop_p,
	get_loop_body, add_bb_to_loop, remove_bb_from_loops,
	find_common_loop, verify_loop_structure, loop_latch_edge,
	loop_preheader_edge): New functions.
	(flow_loops_cfg_dump): Do not show dominators, as this information
	does not remain up to date long.
	(flow_loops_find): Store results in new format.
	* predict.c (propagate_freq, estimate_probability,
	estimate_loops_at_level, estimate_bb_frequencies): Use new loop
	infrastructure.

From-SVN: r54142