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Summary: We were adding a `Sym` to one argument in the `InstCo` case of `optCoercion` but not another, leading to the two arguments to misaligned when combined via `Trans`. This fixes the issue with a well targeted use of `wrapSym`. Test Plan: make test TEST=T15725 Reviewers: goldfire, ningning, bgamari Reviewed By: goldfire, ningning Subscribers: rwbarton, carter GHC Trac Issues: #15725 Differential Revision: https://phabricator.haskell.org/D5217
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