[GHC] #9714: Un-`wire` Integer type

[GHC]

#9714: Un-`wire` Integer type
-------------------------------------+-------------------------------------
       Reporter:  hvr                |                   Owner:
           Type:  task               |                  Status:  new
       Priority:  normal             |               Milestone:  7.10.1
      Component:  Compiler           |                 Version:
       Keywords:  Integer            |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Moderate (less     |         Type of failure:
  than a day)                        |  None/Unknown
     Blocked By:                     |               Test Case:
Related Tickets:  #9281              |                Blocking:
                                     |  Differential Revisions:  Phab:351
-------------------------------------+-------------------------------------
 `Integer` is currently a wired-in type for `integer-gmp`. This requires
 replicating its inner structure in `TysWiredIn.lhs`, which makes it much
 harder to change `Integer` to a more complex representation (like e.g. for
 #9281)

 In order to reduce the redundancy (due to wired-in type mirroring) and
 simplify the code, as
 [http://thread.gmane.org/gmane.comp.lang.haskell.ghc.devel/5823/ suggested
 by Simon], `Integer` should no longer be a `wired-in` type  but rather
 become a `known-key`-entity.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9714>
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