Register class static data and thread static data directly as roots, since we...

Register class static data and thread static data directly as roots, since we do not track dirty state for static fields. Without this we miss writes in the incremental case.

mono/metadata/object.c

@@ -1871,6 +1871,7 @@ mono_class_create_runtime_vtable (MonoDomain *domain, MonoClass *class, gboolean
 			/*g_print ("bitmap 0x%x for %s.%s (size: %d)\n", bitmap [0], class->name_space, class->name, class_size);*/
 			statics_gc_descr = mono_gc_make_descr_from_bitmap (bitmap, max_set + 1);
 			vt->data = mono_gc_alloc_fixed (class_size, statics_gc_descr);
+			mono_gc_register_root (vt->data, class_size, NULL);
 			mono_domain_add_class_static_data (domain, class, vt->data, NULL);
 			if (bitmap != default_bitmap)
 				g_free (bitmap);

mono/metadata/threads.c

@@ -3548,6 +3548,7 @@ mono_alloc_static_data (gpointer **static_data_ptr, guint32 offset)
 	gpointer* static_data = *static_data_ptr;
 	if (!static_data) {
 		static_data = mono_gc_alloc_fixed (static_data_size [0], NULL);
+		mono_gc_register_root (static_data, static_data_size [0], NULL);
 		*static_data_ptr = static_data;
 		mono_gc_wbarrier_generic_store_ptr (&static_data [0], static_data);
 	}