New J2K: Split old j2k and new j2k tests

nj2k/testData/newJ2k/detectProperties/GetterWithSideEffect5.java

@@ -0,0 +1,12 @@
+public class C {
+    private String x = "";
+
+    public String getX() {
+        System.out.println("getter invoked");
+        return this.x;
+    }
+
+    public void setX(String x) {
+        this.x = x;
+    }
+}