Add support for line merger of double arrows and array tokens

Please update test with
```php
            array(
                '<?php
    $a = array(
        "aaaaaa" =>    array(),
        "c" =>
        array(),
        "eeeeee" =>    array(),
    );',
                '<?php
    $a = array(
        "aaaaaa" =>    array(),
        "c" => array(),
        "eeeeee" =>    array(),
    );',
            ),
```