[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:  patch
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Core Libraries    |              Version:  7.8.2
      Resolution:                    |             Keywords:  Generics
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:  9766              |             Blocking:
 Related Tickets:  #8778             |  Differential Rev(s):  Phab:D1937
       Wiki Page:                    |
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Changes (by bgamari):

 * status:  new => patch
 * differential:   => Phab:D1937
 * milestone:   => 8.0.1


Comment:

 Here is a patch derived from ocharles' branch.

 Given that this is only a library change I'd be fine with sneaking this in
 to 8.0.1 if there's no objection.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9043#comment:39>
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