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`Hoopl.Graph` has almost exactly the same function, so let's use that. Also, use `IntMap.alter` to make it more efficient. Also switch `Hoopl` to use strict maps. Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com> Test Plan: ./validate Reviewers: bgamari, simonmar Reviewed By: bgamari Subscribers: dfeuer, rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4493
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