The edge_count field is unused after node first edge indexes have been built. Store node retained size in there instead of allocating an extra array for it.
Created attachment 146031 [details] Patch
Comment on attachment 146031 [details] Patch lgtm
Comment on attachment 146031 [details] Patch Clearing flags on attachment: 146031 Committed r119714: <http://trac.webkit.org/changeset/119714>
All reviewed patches have been landed. Closing bug.