[GHC] #10504: GHC panics with dsImpSpecs on SPECIALISE pragma with -fhpc enabled

[GHC]

#10504: GHC panics with dsImpSpecs on SPECIALISE pragma with -fhpc enabled
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        Reporter:  nh2               |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by nh2):

 By the way, ignore the fact that the repository has `omit-interface-
 pragmas` in its name - I originally thought that this problem only happens
 when I enable `-fomit-interface-pragmas`, but it already happens on plain
 `-fhpc`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10504#comment:2>
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