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Phab:D493 accidentally changed the way GHC generics looks up `Fixity`
information when deriving `Generic` or `Generic1`. Before, a `Fixity` of
`Infix` would be given only if a data constructor was declared infix,
but now, `Infix` is given to any data constructor that has a fixity
declaration (not to be confused with being declared infix!). This commit
reverts back to the original behavior for consistency's sake.
Fixes #11358.
Test Plan: ./validate
Reviewers: kosmikus, dreixel, austin, bgamari
Reviewed By: bgamari
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D1740
GHC Trac Issues: #11358
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