[GHC] #13186: Change EvNum to EvNum :: Natural -> EvLit

[GHC]

#13186: Change EvNum to EvNum :: Natural -> EvLit
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        Reporter:  phadej            |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8306 #8412       |  Differential Rev(s):
  #13181                             |
       Wiki Page:                    |
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Comment (by mpickering):

 This seems very invasive but for what? The situation where the internal
 representation is an `Integer` but the representation exposed is a
 `Natural` seems much easier to implement.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13186#comment:1>
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