[GHC] #8115: GHC 64-bit Windows build failures with LLVM

[GHC]

#8115: GHC 64-bit Windows build failures with LLVM
---------------------------------+------------------------------------
        Reporter:  schyler       |            Owner:
            Type:  bug           |           Status:  new
        Priority:  highest       |        Milestone:
       Component:  Compiler      |          Version:  7.6.3
      Resolution:                |         Keywords:
Operating System:  Windows       |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |       Difficulty:  Unknown
       Test Case:                |       Blocked By:
        Blocking:                |  Related Tickets:
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Comment (by awson):

 7.8.1 suffers from #7143.

 Workaround `-pgmlo opt -pgmlc llc` works, but executable produced by
 64-bit 7.8.1 from the following code:
 {{{
 import System.Mem (performMajorGC)

 main = performMajorGC >> putStrLn "Done"
 }}}
 segfaults.

 Switching off optimization does not help. Switching between LLVM 3.4 and
 3.5svn does not help either.

 Executable produced by 32-bit 7.8.1 works.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8115#comment:6>
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