* cfg.c (unchecked_make_edge): Call execute_on_growing_pred
	after making an edge.
	(remove_edge): Call execute_on_shrinking_pred before removing
	an edge.
	(redirect_edge_succ): Call execute_on_growing_pred and
	execute_on_shrinking_pred.
	* cfghooks.c (execute_on_growing_pred): New.
	(execute_on_shrinking_pred): Likewise.
	* cfghooks.h (cfg_hooks): Add execute_on_growing_pred and
	execute_on_shrinking_pred.
	Add prototypes for execute_on_growing_pred and
	execute_on_shrinking_pred.
	* cfgrtl.c (rtl_cfg_hooks): Add NULL hooks to
	execute_on_growing_pred and execute_on_shrinking_pred.
	(cfg_layout_rtl_cfg_hook): Likewise.
	* tree-cfg.c (tree_cfg_hooks): Likewise.

From-SVN: r91035