[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)
-------------------------------------+-------------------------------------
        Reporter:  ezyang            |                Owner:  thomie
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Test Suite        |              Version:  7.9
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1187
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  new => closed
 * resolution:   => fixed
 * milestone:   => 8.2.1


Comment:

 Fixed by running each test in a fresh `/tmp` directory (#11980).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8990#comment:11>
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