[GHC] #1558: make the testsuite work with THREADS=2

[GHC]

#1558: make the testsuite work with THREADS=2
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 Reporter:  simonmar    |          Owner:  igloo      
     Type:  bug         |         Status:  new        
 Priority:  high        |      Milestone:  6.10 branch
Component:  Test Suite  |        Version:  6.6.1      
 Severity:  normal      |     Resolution:             
 Keywords:              |     Difficulty:  Easy (1 hr)
 Testcase:              |   Architecture:  Unknown    
       Os:  Unknown     |  
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Changes (by igloo):

  * owner:  => igloo

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1558#comment:9>
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