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This reduces peak memory usage by ~30% on my test case (DynFlags), and (probably as a result of reduced GC work) decreases compilation time by a few percent as well. Also fix a bug in seqStrDmd so that demeand info is fully evaluated. Reviewers: simonpj, austin, bgamari Reviewed By: bgamari Subscribers: dfeuer, thomie Differential Revision: https://phabricator.haskell.org/D3400
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