[GHC] #7994: Make foldl into a good consumer

[GHC]

#7994: Make foldl into a good consumer
-------------------------------------+------------------------------------
        Reporter:  simonpj           |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 Interesting: Even without the `oneShot` marker surviving the unfolding,
 nofib shows some extreme changes in allocations:
 {{{
         Program           Size    Allocs   Runtime   Elapsed  TotalMem
 --------------------------------------------------------------------------------
      bernouilli          +0.1%     -4.2%      0.12      0.12     +0.0%
            fft2          +0.0%   +125.4%      0.04      0.05     +0.0%
     gen_regexps          +0.0%     -9.4%      0.00      0.00     +0.0%
       integrate          +0.1%   +144.2%      0.14      0.14     +1.0%
         minimax          +0.0%     -3.8%      0.00      0.00     +0.0%
          simple          +0.1%     -7.5%      0.15      0.15    -14.7%
            x2n1          +0.1%    -45.2%      0.00      0.00    -50.0%
 --------------------------------------------------------------------------------
             Min          -0.9%    -45.2%    -27.5%    -27.7%    -50.0%
             Max          +0.2%   +144.2%     +3.1%     +3.1%   +100.0%
  Geometric Mean          +0.0%     +0.8%     -5.9%     -5.7%     -0.3%
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7994#comment:10>
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