Added a typecast to work around issue that the types did not match because of the use of an interface

Signed-off-by: Stefan Marr <git@stefan-marr.de>

Author: smarr

graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/node/NodeCodeGenerator.java

@@ -794,6 +794,7 @@ private ExecutableElement createGetFactories(NodeData node) {
 
             for (NodeData child : children) {
                 builder.startGroup();
+                builder.cast(Utils.getSimpleName(baseType));
                 NodeData childNode = child;
                 List<NodeData> factories = new ArrayList<>();
                 while (childNode.getDeclaringNode() != null) {