[GHC] #9274: GHC panic with UnliftedFFITypes+CApiFFI

[GHC]

#9274: GHC panic with UnliftedFFITypes+CApiFFI
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        Reporter:  hvr                 |            Owner:
            Type:  bug                 |           Status:  new
        Priority:  normal              |        Milestone:  7.10.1
       Component:  Compiler            |          Version:  7.6.3
      Resolution:                      |         Keywords:
Operating System:  Unknown/Multiple    |     Architecture:
 Type of failure:  Compile-time crash  |  Unknown/Multiple
       Test Case:                      |       Difficulty:  Unknown
        Blocking:                      |       Blocked By:
                                       |  Related Tickets:
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Comment (by hvr):

 Here's a simpler example (stolen from `Data.ByteString.Short.Internal`
 which uses `ccall`):

 {{{#!hs
 {-# LANGUAGE MagicHash #-}
 {-# LANGUAGE CApiFFI #-}
 {-# LANGUAGE UnliftedFFITypes #-}

 foreign import capi unsafe "string.h memcmp"
   c_memcmp_ByteArray :: ByteArray# -> ByteArray# -> CSize -> IO CInt
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9274#comment:1>
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