static transformAsyncGeneratorBody(identifierGenerator, reporter, options,
                                     body, name) {
    return new AsyncGeneratorTransformer(identifierGenerator, reporter,
                                         options).
        transformAsyncGeneratorBody_(body, name);
  }
@param {UniqueIdentifierGenerator} identifierGenerator
@param {ErrorReporter} reporter
@param {Options} options
@param {Block} body
@param {IdentifierExpression} name
@return {Block}