support the `match` operator in constant expressions

### Description

The following is supported (https://3v4l.org/gUPpH):

```php
const FOO = PHP_INT_SIZE === 8 ? '64bit' : (PHP_INT_SIZE === 4 ? '32bit' : throw new \Error('unexpected'));
```

I’d like to write (https://3v4l.org/FRO6A):

```php
const FOO = match (PHP_INT_SIZE) { 8 => '64bit', 4 => '32bit' };
```
