revised**2 x86_64-pc-mingw32 patch

[Richard Henderson <rth at redhat dot com>]

Thanks to Kai for providing a set of w64 header files, so that I
could cross-compile libgcc and libstdc++.

This fixes up a number of mistakes in the calling convention code,
which were causing ICEs and the like.

I've also fixed the place in the thunk code that was still emitting
the @GOTPCREL references.  I insist that flag_pic should be set,
as that enables the use of rip-relative addressing for most symbols,
which is definitely desirable for win64 code.


r~

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