[GHC] #14127: -fignore-interface-pragmas and -fspecialise do not go well together

[GHC]

#14127: -fignore-interface-pragmas and -fspecialise do not go well together
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        Reporter:  lspitzner         |                Owner:  (none)
            Type:  bug               |               Status:  infoneeded
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 To make things more interesting, I can reproduce this panic on GHC 8.0.2,
 but not on 8.2.1.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14127#comment:4>
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