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Summary:
Unlike `-XDefaultSignatures`, `-XDeriveAnyClass` would not fill in
associated type family defaults when deriving a class which contained
them.
In order to fix this properly, `tcATDefault` needed to be used from
`TcGenDeriv`. To avoid a module import cycle, `tcATDefault` was moved
from `TcInstDcls` to `TcClsDcl`.
Fixes #10361.
Test Plan: ./validate
Reviewers: kosmikus, dreixel, bgamari, austin, simonpj
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D1283
GHC Trac Issues: #10361
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