Summary:
We have two troubles with this script:
# Our revisions and commits don't fit in the memory. (Our tasks do :-).)
# Reindexing revisions is slow.
Test Plan: Ran it.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D3483