[GHC] #15366: GHC.Conc.Windows has a surprising queue

[GHC]

#15366: GHC.Conc.Windows has a surprising queue
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           Reporter:  dfeuer         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.8.1
          Component:  Core           |           Version:  8.4.3
  Libraries                          |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Runtime
  Unknown/Multiple                   |  performance bug
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 `GHC.Conc.Windows` seems to use `[DelayReq]` as a priority queue, and uses
 `foldr` to insert multiple elements into it. Unless these lists are always
 very short (are they?) that seems like a bad idea.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15366>
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