[GHC] #7865: SpecConstr duplicating computations

[GHC]

#7865: SpecConstr duplicating computations
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Reporter:  amosrobinson             |          Owner:                  
    Type:  bug                      |         Status:  new             
Priority:  normal                   |      Component:  Compiler        
 Version:                           |       Keywords:  SpecConstr      
      Os:  Unknown/Multiple         |   Architecture:  Unknown/Multiple
 Failure:  Runtime performance bug  |      Blockedby:                  
Blocking:                           |        Related:                  
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Comment(by amosrobinson):

 Or maybe just let-floating on constructors would fix it?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7865#comment:2>
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