[php-src] Issue #21760: Trait with class constant name conflict against enum case causes SEGV

Issue: https://github.com/php/php-src/issues/21760
Author: ndossche

### Description

The following code:

```php
<?php
trait X {
  public const Up = 1;
}

enum Direction {
  use X;

  case Up;
  case Down;
}
```

Resulted in this output:
```
SEGV
```

But I expected this output instead:
```
Not that
```


### PHP Version

```plain
Reproduced on master but likely affects all versions since enums were added
```

### Operating System

_No response_