Description:
------------
On:
PHP 8.0.0 (cli) (built: Dec  1 2020 04:01:52) ( NTS )
Copyright (c) The PHP Group
Zend Engine v4.0.0-dev, Copyright (c) Zend Technologies


When tokenizing as following:

```
<?php token_get_all('<?php $foo = $a?->b();', TOKEN_PARSE);
```

the T_NULLSAFE_OBJECT_OPERATOR is missing

https://3v4l.org/t5aAA

Test script:
---------------
```
<?php token_get_all('<?php $foo = $a?->b();', TOKEN_PARSE);
```

results in something like:
```

array(10) {
  [0]=>
  array(3) {
    [0]=>
    int(390)
    [1]=>
    string(6) "<?php "
    [2]=>
    int(1)
  }
  [1]=>
  array(3) {
    [0]=>
    int(315)
    [1]=>
    string(4) "$foo"
    [2]=>
    int(1)
  }
  [2]=>
  array(3) {
    [0]=>
    int(393)
    [1]=>
    string(1) " "
    [2]=>
    int(1)
  }
  [3]=>
  string(1) "="
  [4]=>
  array(3) {
    [0]=>
    int(393)
    [1]=>
    string(1) " "
    [2]=>
    int(1)
  }
  [5]=>
  array(3) {
    [0]=>
    int(315)
    [1]=>
    string(2) "$a"
    [2]=>
    int(1)
  }
  [6]=>
  array(3) {
    [0]=>
    int(311)
    [1]=>
    string(1) "b"
    [2]=>
    int(1)
  }
  [7]=>
  string(1) "("
  [8]=>
  string(1) ")"
  [9]=>
  string(1) ";"
}
```

expected same result as 


```
<?php token_get_all('<?php $foo = $a?->b();');
```


```
array(11) {
  [0]=>
  array(3) {
    [0]=>
    int(390)
    [1]=>
    string(6) "<?php "
    [2]=>
    int(1)
  }
  [1]=>
  array(3) {
    [0]=>
    int(315)
    [1]=>
    string(4) "$foo"
    [2]=>
    int(1)
  }
  [2]=>
  array(3) {
    [0]=>
    int(393)
    [1]=>
    string(1) " "
    [2]=>
    int(1)
  }
  [3]=>
  string(1) "="
  [4]=>
  array(3) {
    [0]=>
    int(393)
    [1]=>
    string(1) " "
    [2]=>
    int(1)
  }
  [5]=>
  array(3) {
    [0]=>
    int(315)
    [1]=>
    string(2) "$a"
    [2]=>
    int(1)
  }
  [6]=>
  array(3) {
    [0]=>
    int(387)
    [1]=>
    string(3) "?->"
    [2]=>
    int(1)
  }
  [7]=>
  array(3) {
    [0]=>
    int(311)
    [1]=>
    string(1) "b"
    [2]=>
    int(1)
  }
  [8]=>
  string(1) "("
  [9]=>
  string(1) ")"
  [10]=>
  string(1) ";"
}
```

note the T_NULLSAFE_OBJECT_OPERATOR token @ index 6 

https://3v4l.org/t5aAA