[GHC] #4801: Typechecker performance regression 6.12 -> 7.0.1

[GHC]

#4801: Typechecker performance regression 6.12 -> 7.0.1
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        Reporter:  simonmar                 |            Owner:  simonpj
            Type:  bug                      |           Status:  closed
        Priority:  high                     |        Milestone:  7.0.2
       Component:  Compiler (Type checker)  |          Version:  7.0.1
      Resolution:  fixed                    |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  None/Unknown             |  Unknown/Multiple
       Test Case:  perf/compiler/T4801      |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
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Comment (by jstolarek):

 Yes, at some point this test was sometimes failing for me, but for the
 last 3 weeks I've been getting clean validation runs.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4801#comment:7>
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