[GHC] #9368: Add strictly accumulating scanl' to Data.List

[GHC]

#9368: Add strictly accumulating scanl' to Data.List
-------------------------------------+-------------------------------------
       Reporter:  dfeuer             |                   Owner:
           Type:  feature request    |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  libraries/base     |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Easy (less than 1  |         Type of failure:
  hour)                              |  None/Unknown
     Blocked By:                     |               Test Case:
Related Tickets:  #9345              |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 Joachim Breitner wrote a strictly accumulating fusable `scanl'` in a
 comment on #9345, and demonstrated that it can produce spectacularly good
 code. Therefore, it seems like a good thing to have in Data.List.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9368>
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