[GHC] #14529: Refactor ConDecl

[GHC]

#14529: Refactor ConDecl
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           Reporter:  simonpj        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The `ConDeclGADT` constructor in `ConDecl` is awful; all the information
 is buried.  Refactor it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14529>
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