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This patch will allow `zip3` and `zipWith3` in `GHC.List` as well as `zipWith4`, `zipWith5`, `zipWith6` and `zipWith7` in `Data.OldList` to fuse. These rules are kept in a similar style as the rules for `zip` and `zipWith`. Added a corresponding test case. Test Plan: validate Reviewers: hvr, bgamari, simonpj Reviewed By: simonpj Subscribers: simonpj, rockbmb, rwbarton, carter GHC Trac Issues: #15263 Differential Revision: https://phabricator.haskell.org/D5241
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