[GHC] #2580: export Data.Map.toDescList

[GHC]

#2580: export Data.Map.toDescList
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    Reporter:  elaforge        |        Owner:         
        Type:  proposal        |       Status:  new    
    Priority:  normal          |    Milestone:         
   Component:  libraries/base  |      Version:  6.8.3  
    Severity:  normal          |   Resolution:         
    Keywords:                  |     Testcase:         
Architecture:  Unknown         |           Os:  Unknown
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Comment (by elaforge):

 Replacing patch with one that actually uncomments foldl so toDescList
 works, and exports foldl as foldlWithKey.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2580#comment:1>
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