[GHC] #7122: Slightly extend performance range for T1969 and T3294

[GHC]

#7122: Slightly extend performance range for T1969 and T3294
------------------------------+---------------------------------------------
 Reporter:  nomeata           |          Owner:                  
     Type:  bug               |         Status:  new             
 Priority:  normal            |      Component:  Test Suite      
  Version:  7.5               |       Keywords:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown      |       Testcase:                  
Blockedby:                    |       Blocking:                  
  Related:                    |  
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 When running the validate on a machine of mine (i386 chroot on an amd64
 machine), these two test cases fail due to slightly differing performance
 values. Assuming these are just statistical errors, I suggest the attached
 patch to widen the accepted range. Thanks!

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7122>
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