[GHC] #2859: Reduce coercion terms to normal form

[GHC]

#2859: Reduce coercion terms to normal form
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    Reporter:  simonpj                       |        Owner:                  
        Type:  compile-time performance bug  |       Status:  new             
    Priority:  normal                        |    Milestone:  6.12 branch     
   Component:  Compiler                      |      Version:  6.10.1          
    Severity:  normal                        |   Resolution:                  
    Keywords:                                |   Difficulty:  Unknown         
    Testcase:                                |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple              |  
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Changes (by kfrdbs):

 * cc: kfrdbs at gmail.com (added)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2859#comment:2>
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