[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:  przembot
            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 Revisions:
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Comment (by ezyang):

 I found another case recently where this matters: whether or not an
 interface file is loaded can affect the assignment of uniques, which in
 turn can cause rules to fire in a different order. (in my case, it was
 `T7837` with the patchset I've been developing for #10871).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8990#comment:4>
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