[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:
       Component:  libraries/base    |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by hvr):

 Replying to [comment:10 ocharles]:
 > If people are happy with this, I will probably rewrite the branch to be
 a single commit, unless people feel the history here is relevant.

 ...please put whitespace changes in a separate commit though :-)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9043#comment:12>
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