Build GHC on Windows using Microsoft toolchain

Create a Windows "native" port of GHC, i.e. one that uses the Microsoft toolchain instead of GCC and the GNU binutils. The main tasks are:

• Convert the pretty printer in the i386 NCG to generate MS/Intel syntax

  instead of AT&T syntax. We can then generate assembly code that MASM can

  grok.

• Make the RTS compile with Microsoft's CL compiler. (this has been done in

  the past, so shouldn't be too much work).

• Drop any dependencies on mingw32 functionality in the libraries.

• Make appropriate modifications to the driver, build system etc. We'd still

  need Cygwin/MSYS for build tools (dropping dependency on GNU make is another task

  entirely...)

Trac metadata

Trac field	Value
Version	6.7
Type	Task
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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