Mark enums and static fake closures as not collectable

[iluuu1994]

Simple synthetic benchmark:

function foo() {}

$array = [];
for ($i = 0; $i < 10_000_000; $i++) {
    $array[] = foo(...);
}

foreach ($array as $foo) {}

echo json_encode(gc_status(), JSON_PRETTY_PRINT);

❯ php-old -d memory_limit=-1 test.php
{
    "running": false,
    "protected": false,
    "full": false,
    "runs": 44,
    "collected": 0,
    "threshold": 450001,
    "buffer_size": 524288,
    "roots": 100043,
    "application_time": 1.841229413,
    "collector_time": 0.203653695,
    "destructor_time": 0,
    "free_time": 0
}

❯ php-new -d memory_limit=-1 test.php
{
    "running": false,
    "protected": false,
    "full": false,
    "runs": 0,
    "collected": 0,
    "threshold": 10001,
    "buffer_size": 16384,
    "roots": 0,
    "application_time": 1.635467089,
    "collector_time": 0,
    "destructor_time": 0,
    "free_time": 0
}

There should be virtually no downside to this, so hopefully this is still good for 8.5?

[bwoebi]

This looks sensible to me.