Little improvement in code generated for equals() by @EqualsAndHashCode ast transformation

class C {
      String a, b
      boolean equals(Object other) {
              ...
              ...
              if(!(other instanceof C)) {return false}
              if(this.a != other.a) {...}
              if(this.b != other.b) {...}
              ...
      }
}

class C {
      String a, b
      boolean equals(Object other) {
              ...
              ...
              if(!(other instanceof C)) {return false}
              C another = (C) other
              if(this.a != another.a) {...}
              if(this.b != another.b) {...}
              ...
      }
}