Track dep_finsts in exports hash, as it affects downstream deps.
Summary: I also added some more comments about the orphan and family instance hashing business. Fixes #12723. Signed-off-by: Edward Z. Yang <firstname.lastname@example.org> Test Plan: validate Reviewers: bgamari, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2607 GHC Trac Issues: #12723
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