Rev 3899: Shave 5s->3.3s in add_source by copying old entries across directly. in http://bzr.arbash-meinel.com/branches/bzr/brisbane/gc_delta_index_room

[John Arbash Meinel]

At http://bzr.arbash-meinel.com/branches/bzr/brisbane/gc_delta_index_room

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revno: 3899
revision-id: john at arbash-meinel.com-20090319044442-op8a05tpsq3nqid2
parent: john at arbash-meinel.com-20090319040218-pqex5298ifl1ds54
committer: John Arbash Meinel <john at arbash-meinel.com>
branch nick: gc_delta_index_room
timestamp: Wed 2009-03-18 23:44:42 -0500
message:
  Shave 5s->3.3s in add_source by copying old entries across directly.
  This works quite a bit better than copying them over into the hash
  and then copying them *back* into the final packed form.
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