[GHC] #9164: Hunt down uses of `castPtr`

[GHC]

#9164: Hunt down uses of `castPtr`
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        Reporter:  nomeata           |            Owner:
            Type:  task              |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  libraries/base    |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 Ok, forgot about the re-export.

 So if #9163 can be solved with `castPtr` being free, then this ticket
 becomes moot.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9164#comment:3>
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