[GHC] #10885: Crashes on FFI calls to Visual Studio-built C library

[GHC]

#10885: Crashes on FFI calls to Visual Studio-built C library
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        Reporter:  mwu               |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Windows           |            Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  Runtime crash     |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by rwbarton):

 I hardly know anything about Windows and its calling conventions (for
 example I have no idea how `OSMinGW32` is a possible platform when
 compiling 64-bit code) but a while ago I noticed at
 https://en.wikipedia.org/wiki/X86_calling_conventions#Microsoft_x64_calling_convention
 something about a shadow space which as far as I can see we don't take
 into account in `genCCall64'`. Could this be the cause?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10885#comment:3>
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