[GHC] #9337: Add `sortOn` function to Data.List

[GHC]

#9337: Add `sortOn` function to Data.List
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              Reporter:              |             Owner:
  JohnWiegley                        |            Status:  new
                  Type:  feature     |         Milestone:  7.10.1
  request                            |           Version:  7.8.3
              Priority:  normal      |          Keywords:
             Component:              |  Operating System:  Unknown/Multiple
  libraries/base                     |   Type of failure:  None/Unknown
            Resolution:              |         Test Case:
Differential Revisions:              |          Blocking:
          Architecture:              |
  Unknown/Multiple                   |
            Difficulty:  Easy (less  |
  than 1 hour)                       |
            Blocked By:              |
       Related Tickets:              |
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Comment (by hvr):

 wait a minute... why did you resubmit this? wasn't this already handled by
 #9004?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9337#comment:4>
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