[GHC] #9758: By default, testsuite should clean up after successful tests

[GHC]

#9758: By default, testsuite should clean up after successful tests
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       Reporter:  ezyang             |                   Owner:
           Type:  task               |                  Status:  new
       Priority:  low                |               Milestone:
      Component:  Test Suite         |                 Version:  7.9
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 A fully built GHC compiler for development takes about 1G of space.
 However, running the testsuite balloons this amount to 10G. Why? Because
 we don't clear away any test files by default.

 Now, it's pretty useful to have these files if you're debugging a problem.
 But I think it's pretty unnecessary for successful tests. So I suggest
 cleaning out the files automatically if the test succeeds.

 Tradeoff: the testsuite will take longer to run since it is cleaning up
 after itself.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9758>
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