[amd64-windows] Fix function calls on amd64-windows

[Christopher Faylor]

On Mon, Jan 25, 2010 at 09:42:09AM +0400, Joel Brobecker wrote:
>Hello,
>
>The following patch series enhances the amd64 function-call and
>return-value code to handle the Microsoft ABI for amd64-windows.
>As it turned out, the principles where relatively similar to
>the ABI used on Linux systems, but the details where quite significantly
>different (list of integer registers, parameters passed by memory,
>etc).
>
>These patches were tested on x86_64-linux using the official testsuite,
>as well as on x86_64-windows, but using AdaCore's testsuite.
>
>I'd like to commit in a few days if there are no objection.

I don't believe that I am the maintainer of the x86_64 files but these
changes look ok to me.

cgf