[GHC] #609: Useful optimisation for set-cost-centre

[GHC]

#609: Useful optimisation for set-cost-centre
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 Reporter:  simonpj   |          Owner:                  
     Type:  task      |         Status:  new             
 Priority:  normal    |      Milestone:  6.6.1           
Component:  Compiler  |        Version:  None            
 Severity:  normal    |     Resolution:  None            
 Keywords:            |     Difficulty:  Moderate (1 day)
 Testcase:            |   Architecture:  Unknown         
       Os:  Unknown   |  
----------------------+-----------------------------------------------------
Changes (by igloo):

  * milestone:  => 6.6.1
  * testcase:  =>

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/609>
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