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Simon Marlow authored
Summary: This cuts allocations by about a quarter. Test Plan: * validate * `ghci -fexternal-interpreter` in `nofib/real/anna` Reviewers: niteria, bgamari, ezyang, austin, hvr, erikd Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1875 GHC Trac Issues: #11100
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