HHH-11934 Make the delegate field accessible to child classes

hibernate-core/src/main/java/org/hibernate/engine/spi/SessionFactoryDelegatingImpl.java

@@ -73,6 +73,10 @@ public class SessionFactoryDelegatingImpl implements SessionFactoryImplementor,
 		this.delegate = delegate;
 	}
 
+	protected SessionFactoryImplementor getDelegate() {
+		return delegate;
+	}
+
 	@Override
 	public SessionFactoryOptions getSessionFactoryOptions() {
 		return delegate.getSessionFactoryOptions();