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The target of this patch is exports such as:
```
module Foo ( T(A, B, C) ) where
```
Essentially this patch makes sure that we use the correct lookup functions in order
to lookup the names in parent-children export lists. This change
highlighted the complexity of this small part of GHC which accounts for
the scale.
This change was motivated by wanting to
remove the `PatternSynonym` constructor from `Parent`. As with all these
things, it quickly spiraled out of control into a much larger refactor.
Reviewers: simonpj, goldfire, bgamari, austin
Subscribers: adamgundry, thomie
Differential Revision: https://phabricator.haskell.org/D2179
GHC Trac Issues: #11970
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