[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 ocharles):

 Ok, my branch has been updated with the Data instances. I think we're all
 done here! Here's the final diff that needs reviewing:

 https://github.com/ocharles/ghc/compare/master...generics-instances

 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.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9043#comment:10>
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