[GHC] #3803: addCoverageTicksTobind should not panic when file location is Nothing

[GHC]

#3803: addCoverageTicksTobind should not panic when file location is Nothing
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    Reporter:  clemens           |        Owner:  igloo       
        Type:  merge             |       Status:  new         
    Priority:  high              |    Milestone:  6.12.2      
   Component:  Compiler          |      Version:  6.12.1      
    Keywords:  hpc               |   Difficulty:              
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Changes (by simonmar):

  * type:  bug => merge


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3803#comment:4>
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