[GHC] #1179: 20x slow down with -O or -O2

[GHC]

#1179: 20x slow down with -O or -O2
----------------------+-----------------------------------------------------
 Reporter:  dons      |          Owner:           
     Type:  bug       |         Status:  closed   
 Priority:  normal    |      Milestone:           
Component:  Compiler  |        Version:  6.6      
 Severity:  normal    |     Resolution:  duplicate
 Keywords:  slow      |     Difficulty:  Unknown  
 Testcase:            |   Architecture:  Multiple 
       Os:  Linux     |  
----------------------+-----------------------------------------------------
Changes (by simonmar):

  * resolution:  => duplicate
  * status:  new => closed

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1179>
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