Win64 Port

(slightly optimistically adding this to the 6.10 milestone).

For Win64 we need:

• A working mingw64 port, which doesn't exist yet. There are experimental

  patches to gcc and binutils, I believe. Alternatively, we could do

  the Windows Native port first, and avoid mingw.

• Win64 has a different calling convention, so all the usual stuff needs

  to be ported: the native code generator, adjustors, FFI support in GHCi, etc.

  Perhaps libffi would make this easier (see #793 (closed)).

Trac metadata

Trac field	Value
Version	6.8.1
Type	Task
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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