[GHC] #5954: Performance regression 7.0 -> 7.2 (still in 7.4)

[GHC]

#5954: Performance regression 7.0 -> 7.2 (still in 7.4)
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        Reporter:  simonmar                 |            Owner:  simonpj
            Type:  bug                      |           Status:  new
        Priority:  high                     |        Milestone:  7.6.2
       Component:  Compiler                 |          Version:  7.4.1
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  Runtime performance bug  |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
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Comment (by carter):

 is this bug still going on in head?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5954#comment:11>
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