[GHC] #8834: 64-bit windows cabal.exe segfaults in GC

[GHC]

#8834: 64-bit windows cabal.exe segfaults in GC
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        Reporter:  awson          |            Owner:
            Type:  bug            |           Status:  patch
        Priority:  highest        |        Milestone:  7.8.1
       Component:  Compiler       |          Version:  7.8.1-rc2
      Resolution:                 |         Keywords:
Operating System:  Windows        |     Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |       Difficulty:  Unknown
       Test Case:                 |       Blocked By:
        Blocking:                 |  Related Tickets:
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Comment (by jstolarek):

 > It's not true that those are the *only* things enabled by -O2

 Just to be clear, I only said they are the only `-O2` things enabled in
 `DynFlags`.

 > I think, this code should be enough:

 Yes, I can confirm that it segfaults.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8834#comment:28>
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