[GHC] #14464: Adjust AltCon Ord instance to match linter requirements.

[GHC]

#14464: Adjust AltCon Ord instance to match linter requirements.
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           Reporter:  AndreasK       |             Owner:  (none)
               Type:  task           |            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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 There is a Ord instance for AltCon which is incompatible with the Core
 Linters requirements.

 Updating it to match the linters requirement seems useful as it allows
 easy sorting of alternatives.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14464>
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