* 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.
From-SVN: r90958
