[GHC] #13384: Windows build thinks sqrt (-1) == -1

[GHC]

#13384: Windows build thinks sqrt (-1) == -1
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  Phyx-
            Type:  bug               |               Status:  patch
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3292
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by Phyx-):

 * status:  upstream => patch
 * differential:   => Phab:D3292


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13384#comment:7>
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