[GHC] #7796: improve dead code elimination in CorePrep

[GHC]

#7796: improve dead code elimination in CorePrep
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Reporter:  nfrisby           |          Owner:  nfrisby         
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  Compiler        
 Version:  7.6.2             |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:  #4962 #5433     
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Comment(by nfrisby):

 SPJ suggested it'd be simpler to parameterize the occurrence analyser to
 disable the binder swap. I'm validating that patch now.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7796#comment:1>
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