memory: MemoryRegion: use /machine as default owner

This will be added (after QOMification) as the QOM parent.
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

memory.c

@@ -849,7 +849,7 @@ void memory_region_init(MemoryRegion *mr,
 {
     mr->ops = &unassigned_mem_ops;
     mr->opaque = NULL;
-    mr->owner = owner;
+    mr->owner = owner ? owner : qdev_get_machine();
     mr->iommu_ops = NULL;
     mr->container = NULL;
     mr->size = int128_make64(size);

vl.c

@@ -3986,12 +3986,11 @@ int main(int argc, char **argv, char **envp)
         exit(1);
     }
 
-    cpu_exec_init_all();
-
     current_machine = MACHINE(object_new(object_class_get_name(
                           OBJECT_CLASS(machine_class))));
     object_property_add_child(object_get_root(), "machine",
                               OBJECT(current_machine), &error_abort);
+    cpu_exec_init_all();
 
     if (machine_class->hw_version) {
         qemu_set_version(machine_class->hw_version);