[GHC] #13683: Use epoll rather than poll where appropriate

[GHC]

#13683: Use epoll rather than poll where appropriate
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           Reporter:  dfeuer            |             Owner:  (none)
               Type:  feature request   |            Status:  new
           Priority:  normal            |         Milestone:  8.4.1
          Component:  Core Libraries    |           Version:  8.0.1
           Keywords:                    |  Operating System:  Linux
       Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
          Test Case:                    |        Blocked By:
           Blocking:                    |   Related Tickets:
Differential Rev(s):                    |         Wiki Page:
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 Linux supports an `epoll` system call that's supposed to scale better to
 large numbers of watched file descriptors than `poll`. We should probably
 use it when available and appropriate.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13683>
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