[fixes #3370] Support Helper in method

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

@@ -0,0 +1,30 @@
+import lombok.experimental.Helper;
+public class HelperInInitializationBlock {
+  {
+    final int z = 5;
+    if (Boolean.TRUE)
+        {
+          @Helper class H1 {
+            H1() {
+              super();
+            }
+            void foo(int x) {
+              System.out.println(("Hello, " + (x + z)));
+            }
+          }
+          final H1 $H1 = new H1();
+          $H1.foo(10);
+          @Helper class H2 {
+            H2() {
+              super();
+            }
+            void bar() {
+              $H1.foo(12);
+            }
+          }
+        }
+  }
+  public HelperInInitializationBlock() {
+    super();
+  }
+}