[GHC] #15897: Negative MUT time in +RTS -s -RTS when heap profiling is enabled

[GHC]

#15897: Negative MUT time in +RTS -s -RTS when heap profiling is enabled
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        Reporter:  maoe              |                Owner:  (none)
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Profiling         |              Version:  8.6.2
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Debugging         |  (amd64)
  information is incorrect           |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 The failures are due to test timing out on CI because it takes too long
 sometimes. I'll try to find a smaller test case. I think I've never tried
 making the input smaller, maybe that still reproduces the bug. I should
 try that first.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15897#comment:12>
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