Proposal #3999: Improved folds for Data.Map and Data.IntMap

[Louis Wasserman]

>
> I'm not sure why you don't just use curry directly here. Also, why not just
> implement toAscList like in the rule and INLINE it?
>
I concede that using curry directly is the better approach, but when I
implement toAscList as in the rule and inline it, it doesn't actually appear
to get inlined.  (Example: mapKeysWith, which is defined as fromListWith c .
List.map fFirst . toList, doesn't actually fold/build with the map.)

Revised, complete patch:
http://hackage.haskell.org/trac/ghc/attachment/ticket/3999/fold-building.patch
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