make ImportNode wrappable when trying to wrap expressions

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/statement/ImportNode.java

@@ -27,14 +27,21 @@
 
 import com.oracle.graal.python.nodes.expression.ExpressionNode;
 import com.oracle.truffle.api.frame.VirtualFrame;
+import com.oracle.truffle.api.instrumentation.GenerateWrapper;
+import com.oracle.truffle.api.instrumentation.ProbeNode;
 
+@GenerateWrapper
 public class ImportNode extends AbstractImportNode {
     private final String moduleName;
 
     public ImportNode(String moduleName) {
         this.moduleName = moduleName;
     }
 
+    public ImportNode(ImportNode original) {
+        this.moduleName = original.moduleName;
+    }
+
     @Override
     public void executeVoid(VirtualFrame frame) {
         importModule(moduleName);
@@ -57,4 +64,9 @@ public Object execute(VirtualFrame frame) {
     public ExpressionNode asExpression() {
         return new ImportExpression(this);
     }
+
+    @Override
+    public WrapperNode createWrapper(ProbeNode probe) {
+        return new ImportNodeWrapper(this, this, probe);
+    }
 }