Summary:
A continuation of #8953. This fixes an oversight in which the
left-hand sides of closed type families, when reified in Template Haskell,
would not be given kind annotations, even when they are necessary for
disambiguation purposes in the presence of `PolyKinds`.

Fixes #8953 and #12646.

Test Plan: ./validate

Reviewers: hvr, bgamari, austin, goldfire

Reviewed By: goldfire

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2795

GHC Trac Issues: #8953, #12646