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Replace the static variable with a PCMachineClass field. This will help us eventually get rid of the pc_compat_*() init functions. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Message-Id: <20190628200227.1053-1-ehabkost@redhat.com> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>