[GHC] #15972: Test nofib tests for correctness in CI

[GHC]

#15972: Test nofib tests for correctness in CI
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           Reporter:  bgamari        |             Owner:  bgamari
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.9
          Component:  Continuous     |           Version:  8.6.2
  Integration                        |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Apparently the result of the `spectral/fft2` nofib test changed at some
 point in the last few months. The difference is likely acceptable given
 the nature of the test but it's nevertheless worrying that we are only
 finding this out now. We really should test nofib tests for correctness as
 part of CI.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15972>
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