[GHC] #15750: Investigate haddock.base perf test

[GHC]

#15750: Investigate haddock.base perf test
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           Reporter:  goldfire       |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Test Suite     |           Version:  8.6.1
           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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 I've seen failures in the `haddock.base` perf test when making changes
 that really should have no effect on performance. My guess is that this
 perf test is sitting right on the line of the acceptable range. We should
 confirm this hunch and then update the values to recenter the range.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15750>
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