[GHC] #9078: Segfault with makeStableName

[GHC]

#9078: Segfault with makeStableName
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        Reporter:  robertce          |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          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 ezyang):

 I believe the bug is when we free stable-name entries (in gcStableTables),
 we also need to remove the stable name from the hash table.
 updateStableTables will not catch this because it only iterates over live
 stable names. The bug is masked because if we immediately make another
 stable pointer, it will probably be put in the right slot, but the ASSERT
 catches the problem immediately.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9078#comment:3>
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