[GHC] #4224: Remove "class DOpt" after new typechecker merge

[GHC]

#4224: Remove "class DOpt" after new typechecker merge
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    Reporter:  igloo             |        Owner:  igloo       
        Type:  task              |       Status:  new         
    Priority:  high              |    Milestone:  6.14.1      
   Component:  Compiler          |      Version:  6.13        
    Keywords:                    |     Testcase:              
   Blockedby:  4232              |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------
Changes (by igloo):

  * blockedby:  => 4232


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4224#comment:1>
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