Description:
------------
When code is preloaded which uses unlinkable anonymous classes,
PHP can crash.  When running the test script in debug mode with
r42a2fb8, I hit an assertion failure:

php7_debug.dll!ZEND_DECLARE_ANON_CLASS_SPEC_HANDLER(_zend_execute_data * execute_data) Line 2449 (c:\php-sdk\phpdev\vc15\x64\php-src-7.4\Zend\zend_vm_execute.h:2449)
php7_debug.dll!execute_ex(_zend_execute_data * ex) Line 53379 (c:\php-sdk\phpdev\vc15\x64\php-src-7.4\Zend\zend_vm_execute.h:53379)
php7_debug.dll!zend_execute(_zend_op_array * op_array, _zval_struct * return_value) Line 57665 (c:\php-sdk\phpdev\vc15\x64\php-src-7.4\Zend\zend_vm_execute.h:57665)
php7_debug.dll!zend_execute_scripts(int type, _zval_struct * retval, int file_count, ...) Line 1664 (c:\php-sdk\phpdev\vc15\x64\php-src-7.4\Zend\zend.c:1664)
php7_debug.dll!php_execute_script(_zend_file_handle * primary_file) Line 2619 (c:\php-sdk\phpdev\vc15\x64\php-src-7.4\main\main.c:2619)
php.exe!do_cli(int argc, char * * argv) Line 962 (c:\php-sdk\phpdev\vc15\x64\php-src-7.4\sapi\cli\php_cli.c:962)
php.exe!main(int argc, char * * argv) Line 1352 (c:\php-sdk\phpdev\vc15\x64\php-src-7.4\sapi\cli\php_cli.c:1352)


Test script:
---------------
preload.inc
<?php
function foo() {
    return new class extends Bar {};
}
?>

test.php
<?php
var_dump(foo()->test());
?>


Expected result:
----------------
object(class@anonymous)#1 (0) {
}


Actual result:
--------------
assertion failure/segfault