* basic-block.h (edge_def): Add dest_idx.

	* cfg.c (unchecked_make_edge): Initialize dest_idx.
	(remove_edge): Simplify the disconnection of an edge from its
	destination.
	(redirect_edge_succ): Likewise.
	* cfghooks.c (verify_flow_info): Check the consistency of
	dest_idx for each edge.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@90958 138bc75d-0d04-0410-961f-82ee72b054a4