[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):

 I am not sure how to fix this. It seems that SpecConstr is trying to do
 the job of the inliner and case of constructor.
 Could we make SpecConstr ignore these cases and run it multiple times,
 between each Simplifier pass? Or perhaps call the Simplifier from
 SpecConstr when this inlining needs to be done?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7865#comment:1>
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