[GHC] #676: Write a performance checker for collections.

[GHC]

#676: Write a performance checker for collections.
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  Reporter:  jpbernardy      |          Owner:         
      Type:  task            |         Status:  new    
  Priority:  normal          |      Milestone:         
 Component:  libraries/base  |        Version:  6.4.1  
  Severity:  normal          |     Resolution:         
  Keywords:  collections     |             Os:  Unknown
Difficulty:  Unknown         |   Architecture:  Unknown
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/676>
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