Description:
------------
This is related to the bug that was reported (and fixed) here:
https://bugs.php.net/bug.php?id=77643

Basically I'm trying to preload some parts of zend framework 3 and the following warning is logged:
PHP Warning:  Can't preload class Zend\Db\Sql\Select with unresolved initializer for constant JOIN_LEFT_OUTER at vendor\zendframework\zend-db\src\Sql\Select.php:21 in Unknown on line 0

The constant is defined as following in Select.php
    const JOIN_LEFT_OUTER  = Join::JOIN_LEFT_OUTER;

where JOIN_LEFT_OUTER is defined in Join.php:
    const JOIN_LEFT_OUTER  = 'left outer';

Test script:
---------------
--INI--
opcache.enable=1
opcache.enable_cli=1
opcache.optimization_level=-1
opcache.preload={PWD}/preload_undef_const_5.inc

preload_undef_const_5.inc:

<?php
$basedirectory = 'C:/test/';
// dependent classes
opcache_compile_file($basedirectory . 'vendor/zendframework/zend-db/src/Sql/Join.php');
opcache_compile_file($basedirectory . 'vendor/zendframework/zend-db/src/Sql/AbstractPreparableSql.php');
opcache_compile_file($basedirectory . 'vendor/zendframework/zend-db/src/Sql/AbstractSql.php');
opcache_compile_file($basedirectory . 'vendor/zendframework/zend-db/src/Sql/SqlInterface.php');
opcache_compile_file($basedirectory . 'vendor/zendframework/zend-db/src/Sql/PreparableSqlInterface.php');
opcache_compile_file($basedirectory . 'vendor/zendframework/zend-db/src/Sql/Platform/PlatformDecoratorInterface.php');

// actual class
opcache_compile_file($basedirectory . 'vendor/zendframework/zend-db/src/Sql/Select.php');


Expected result:
----------------
no warning

Actual result:
--------------
PHP Warning:  Can't preload class Zend\Db\Sql\Select with unresolved initializer for constant JOIN_LEFT_OUTER at vendor\zendframework\zend-db\src\Sql\Select.php:21 in Unknown on line 0