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niteria authored
When loading/reloading with a large number of modules (>5000) the cost of linear lookups becomes significant. The changes here made `:reload` go from 6s to 1s on my test case. The bottlenecks were `needsLinker` in `DriverPipeline` and `getModLoop` in `GhcMake`. Test Plan: ./validate Reviewers: simonmar, austin, bgamari Subscribers: thomie, rwbarton Differential Revision: https://phabricator.haskell.org/D3703
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