[GHC] #14743: `UnsafeReenter` test hangs

[GHC]

#14743: `UnsafeReenter` test hangs
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           Reporter:  osa1           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.5
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 After a `./validate --slow` run `UnsafeReenter` process hangs forever,
 using CPU as well. Not sure if this happens in fast or normal validate
 yet, or which way do I need to reproduce.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14743>
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