[php-src] Issue #22782: Const expr FCC crashes under preloading

Issue: https://github.com/php/php-src/issues/22782
Author: arnaud-lb

### Description

The following code:

``` php
// preload.inc

#[Attribute]
class A {
    function __construct(public mixed $fn) {}
}

#[A(strlen(...))]
class C {
    const CC = strlen(...);

    #[A(strlen(...))]
    function f($arg = strlen(...)) {
        return $arg;
    }
}

const CC = strlen(...);
```

``` php
// preload.php

echo "# Class const\n";
var_dump((C::CC)('hello'));
echo "# Class attr\n";
var_dump((new ReflectionClass(C::class)->getAttributes(A::class)[0]->newInstance()->fn)('hello'));
echo "# Method attr\n";
var_dump((new ReflectionMethod(C::class, 'f')->getAttributes(A::class)[0]->newInstance()->fn)('hello'));
echo "# Method default value\n";
var_dump((new C()->f())('hello'));

```

When executed with

```
$ php -d opcache.enable_cli=1 -d opcache.preload=preload.inc preload.php
```

Resulted in two issues:

 * Preloading evaluates class constants during compilation, but FCCs evaluate to objects, which can't be persisted
 * zend_fcc_ast->fptr is allocated with ZEND_MAP_PTR_NEW during compilation, which results in map ptr collisions later


### PHP Version

```plain
PHP 8.5
```

### Operating System

_No response_