added impl for @UtilityClass.

test/transform/resource/after-ecj/UtilityClass.java

@@ -0,0 +1,33 @@
+final @lombok.experimental.UtilityClass class UtilityClass {
+  protected static class InnerClass {
+    private String innerInnerMember;
+    protected InnerClass() {
+      super();
+    }
+  }
+  private static String someField;
+  static void someMethod() {
+    System.out.println();
+  }
+  private @java.lang.SuppressWarnings("all") @javax.annotation.Generated("lombok") UtilityClass() {
+    super();
+    throw new java.lang.UnsupportedOperationException("This is a utility class and cannot be instantiated");
+  }
+}
+class UtilityInner {
+  static class InnerInner {
+    static final @lombok.experimental.UtilityClass class InnerInnerInner {
+      static int member;
+      private @java.lang.SuppressWarnings("all") @javax.annotation.Generated("lombok") InnerInnerInner() {
+        super();
+        throw new java.lang.UnsupportedOperationException("This is a utility class and cannot be instantiated");
+      }
+    }
+    InnerInner() {
+      super();
+    }
+  }
+  UtilityInner() {
+    super();
+  }
+}