[GHC] #8136: arr020 test fails randomly with ghci way

[GHC]

#8136: arr020 test fails randomly with ghci way
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       Reporter:  jstolarek  |             Owner:
           Type:  bug        |            Status:  new
       Priority:  normal     |         Milestone:
      Component:  GHCi       |           Version:  7.7
       Keywords:             |  Operating System:  Linux
   Architecture:  x86        |   Type of failure:  Runtime crash
     Difficulty:  Unknown    |         Test Case:
     Blocked By:             |          Blocking:
Related Tickets:             |
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 I noticed that when I run arr020 (`make TEST=arr020`) it randomly
 segfaults when running `ghci` way.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8136>
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