[GHC] #13504: registerTimeout can wait too little because it uses Doubles for times

[GHC]

#13504: registerTimeout can wait too little because it uses Doubles for times
-------------------------------------+-------------------------------------
        Reporter:  nh2               |                Owner:  bgamari
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Runtime System    |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3417
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * status:  new => patch
 * differential:   => Phab:D3417
 * milestone:   => 8.4.1


Comment:

 Here is a quick (but rather under-tested) fix.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13504#comment:3>
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