MSVC hook function prologue

[Ross Ridge]

Paolo Bonzini writes:
>The naked attribute has been proposed and bashed to death multiple
>times on the GCC list too.

No, not really.  It's been proposed a few times, but the discussion never
gets anywhere because the i386 maintainers quickly put their foot down
and end it.  That hasn't stopped other ports from implementing a naked
attribute or for that matter developers like me creating their own
private implementations.

					Ross Ridge