Add test case for return in nested block

exec/ReturnInNestedBlock.java

+class Test {
+    public int i;
+
+    public static void main(String[] args) {
+        Test t = new Test();
+        t.i = 1;
+        t.run();
+        System.out.println(t.i);
+    }
+
+    public void run() {
+        {
+            return;
+        }
+        i = 5;
+        return;
+    }
+}

exec/ReturnInNestedBlock.java.out

+1