[GHC] #8974: 64 bit windows executable built with ghc-7.9.20140405+LLVM segfaults

[GHC]

#8974: 64 bit windows executable built with ghc-7.9.20140405+LLVM segfaults
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              Reporter:  awson       |            Owner:
                  Type:  bug         |           Status:  infoneeded
              Priority:  high        |        Milestone:  7.8.4
             Component:  Compiler    |          Version:  7.9
  (LLVM)                             |         Keywords:
            Resolution:              |     Architecture:  x86_64 (amd64)
      Operating System:  Windows     |       Difficulty:  Unknown
       Type of failure:  Runtime     |       Blocked By:
  crash                              |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by Fanael):

 Replying to [comment:22 awson]:
 > AFAIR, the `trunc` alone is '''not''' sufficient. What you propose in
 fact is to '''declare''' a pair of 32-bit int variables instead of one
 64-bit pointer global variable, right?

 As shown in the example, yes. The ideal solution would be to convert that
 truncated value back to `i64`, but even though the LLVM docs say that
 `sext` and `zext` are valid constant expressions, they don't work and
 yield an "Unsupported expression in static initializer" error.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8974#comment:23>
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