[GHC] #8307: iOS patch: fix hangs in threaded runtime

[GHC]

#8307: iOS patch: fix hangs in threaded runtime
-------------------------------------------+-------------------------------
       Reporter:  lukexi                   |             Owner:
           Type:  bug                      |            Status:  new
       Priority:  normal                   |         Milestone:  7.8.1
      Component:  libraries/base           |           Version:  7.7
       Keywords:                           |  Operating System:  Other
   Architecture:  arm                      |   Type of failure:  Runtime
     Difficulty:  Easy (less than 1 hour)  |  crash
     Blocked By:                           |         Test Case:
Related Tickets:                           |          Blocking:
-------------------------------------------+-------------------------------
 Extends two darwin_HOST_OS cases in libraries/base/GHC/Event/Manager.hs to
 cover iOS as well. This fixes hangs occurring on iOS with the threaded
 runtime.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8307>
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