[GHC] #12044: Remove sortWith in favor of sortOn

[GHC]

#12044: Remove sortWith in favor of sortOn
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        Reporter:  cblp              |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  7.10.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #2659             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by thomie):

 I don't understand what the "for good reasons" means in the following
 [https://mail.haskell.org/pipermail/libraries/2014-April/022502.html
 comment]:

 > that name just reminded me of GHC.Exts.sortWith:
 > http://hackage.haskell.org/package/base-4.6.0.1/docs/GHC-
 Exts.html#v:sortWith
 >
 > Which actually has the right type signature, but it's still implemented
 > as compare (f x) (f y), and for good reasons too in this case.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12044#comment:2>
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