Fix a problem with gcc2.95:
Fix a problem with gcc2.95:

//TODO: we should really initialize these entries as forward_edge or
backward_edge, but gcc2.95 has a bug where it zero-initializes these data
elements instead, leading to aborts later on.


git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@10870 0785d39b-7218-0410-832d-ea1e28bc413d

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