[GHC] #5615: ghc produces poor code for `div` with constant powers of 2.

[GHC]

#5615: ghc produces poor code for `div` with constant powers of 2.
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    Reporter:  Lennart   |       Owner:  daniel.is.fischer
        Type:  bug       |      Status:  new              
    Priority:  normal    |   Milestone:  7.6.2            
   Component:  Compiler  |     Version:  7.4.1-rc1        
    Keywords:            |          Os:  Unknown/Multiple 
Architecture:  x86       |     Failure:  None/Unknown     
  Difficulty:  Unknown   |    Testcase:                   
   Blockedby:            |    Blocking:                   
     Related:            |  
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Changes (by carter):

 * cc: carter.schonwald@… (added)


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5615#comment:15>
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