[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:  new
        Priority:  high             |        Milestone:  7.8.3
       Component:  Compiler (LLVM)  |          Version:  7.9
      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 awson):

 I've decided to simplify things and returned to
 [https://ghc.haskell.org/trac/ghc/ticket/8974#comment:12 original design].

 No more magics. Just fixing resulting assembler in the mangler.

 I think the patterns like `..._srt&-1` and `..._info&-1` may not be
 generated by any *other* code and hence could be rewritten to `..._srt`
 and `..._info` safely.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8974#comment:14>
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