[GHC] #4937: Remove indirections caused by sum types, such as Maybe

[GHC]

#4937: Remove indirections caused by sum types, such as Maybe
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  Reporter:  tibbe             |          Owner:                  
      Type:  feature request   |         Status:  new             
  Priority:  normal            |      Milestone:  7.6.2           
 Component:  Compiler          |        Version:  7.0.1           
Resolution:                    |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:                  
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4937#comment:18>
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