[GHC] #9766: Use TypeLits in the meta-data encoding of GHC.Generics

[GHC]

#9766: Use TypeLits in the meta-data encoding of GHC.Generics
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       Reporter:  dreixel            |                   Owner:  dreixel
           Type:  task               |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler           |                 Version:  7.9
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:  9043               |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 This ticket serves to track the task of improving the meta-data
 representation in GHC.Generics as described in the following wiki page:

 https://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/GenericDeriving#Amoreconservativefirstapproachtothisproblem

 I'm working on this in branch `wip/GenericsMetaData`, and I intend to have
 it in 7.10.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9766>
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