code: public static MethodNode addDelegateStaticMethod(Expression expression, ClassNode classNode, MethodNode delegateMethod) {
          return addDelegateStaticMethod(expression, classNode, delegateMethod, null, null, true);
      }
docs: Adds a static method to the given class node that delegates to the given method
  and resolves the object to invoke the method on from the given expression.
  
  @param expression The expression
  @param classNode The class node
  @param delegateMethod The delegate method
  @return The added method node or null if it couldn't be added