[GHC] #15363: Do some cleaning up of the testsuite driver

[GHC]

#15363: Do some cleaning up of the testsuite driver
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        Reporter:  lantti            |                Owner:  lantti
            Type:  task              |               Status:  patch
        Priority:  low               |            Milestone:  8.8.1
       Component:  Test Suite        |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5107
       Wiki Page:                    |
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Changes (by simonpj):

 * differential:   => Phab:D5107


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15363#comment:15>
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