[GHC] #9043: Add missing type class instances for data types in GHC.Generics

[GHC]

#9043: Add missing type class instances for data types in GHC.Generics
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        Reporter:  ocharles          |                Owner:  dreixel
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Core Libraries    |              Version:  7.8.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:  9766              |             Blocking:
 Related Tickets:  #8778             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 #9766, which had been blocking this for a while, has been fixed, so
 there's nothing holding this back at the moment. ocharles, would you be
 willing to rebase your work on top of `master`?

 You'll need to make some changes to work with the latest GHC:
 * `Typeable` instances are now derived automatically for everything, so
 you can remove those.
 * `Arity` has been removed from `GHC.Generics`
 * `GHC.Generics` has added some new datatypes:
  * `FixityI` was added as a type-level counterpart to `Fixity` (this
 probably doesn't need any instances)
  * A new data family (`URec`) was added to support `Generic(1)` instances
 for unboxed types. The data instances could probably use `Functor`,
 `Foldable`, and `Traversable` instances (I ''think'' those would be well-
 kinded, but I'd have to check.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9043#comment:34>
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