[GHC] #13613: Simplify fixIO

[GHC]

#13613: Simplify fixIO
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  task              |               Status:  closed
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Core Libraries    |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by dfeuer):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 This turned out to be the wrong fix; instead we switched to `readMVar`
 with `unsafeDupableInterleaveIO`. See
 239418cf94dede0f116bb859d1bb95891235eb76.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13613#comment:1>
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