[GHC] #8990: Performance tests behave differently depending on presence of .hi file (even with -fforce-recomp)

[GHC]

#8990: Performance tests behave differently depending on presence of .hi file
(even with -fforce-recomp)
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        Reporter:  ezyang            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Test Suite        |              Version:  7.9
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by thomie):

 You can ignore the hint about `Opt_ ForceRecomp`.

 One possible solution:

 * Add `-no-keep-hi-files` (see #4114) for performance tests to the
 function `get_compiler_flags` in the file `testsuite/driver/testlib.py`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8990#comment:9>
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