[GHC] #10830: maximumBy has a space leak

[GHC]

#10830: maximumBy has a space leak
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        Reporter:  NeilMitchell      |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.2.1
       Component:  Core Libraries    |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1205,
       Wiki Page:                    |  Phab:D3109
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Comment (by dalaing):

 I'm not sticking my hand up to dive into the depths of this, but I made
 the change from `foldr1` to `foldl1` and run a validate in case that's
 what people want for the time being.

 Feel free to knock the patch on the head if folks want to go for a deeper
 / more involved approached.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10830#comment:30>
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