base: Add missing instances for Data.Ord.Down
Specifically: * MonadFix * MonadZip * Data * Foldable * Traversable * Eq1 * Ord1 * Read1 * Show1 * Generic * Generic1 Fixes #15098. Reviewers: RyanGlScott, hvr Reviewed By: RyanGlScott Subscribers: sjakobi, rwbarton, thomie, ekmett, carter GHC Trac Issues: #15098 Differential Revision: https://phabricator.haskell.org/D4870
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