minor #964 dont hint the usage of the ApcuClassLoader anymore (backbone87)

This PR was merged into the 2.3 branch.

Discussion
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dont hint the usage of the ApcuClassLoader anymore

the ApcuClassLoader isnt needed for PHP 5.6+ / PHP 7+ anymore, since
Composer can now dump a OPCache optimized static classmap, that has
similar performance characteristics

also the ApcuClassLoader could cause problems with memory fragmentation
for large apps

see composer/composer#5174

Commits
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2acc49f dont hint the usage of the ApcuClassLoader anymore

Author: Tobion

web/app.php

@@ -1,18 +1,9 @@
 <?php
 
-use Symfony\Component\ClassLoader\ApcClassLoader;
 use Symfony\Component\HttpFoundation\Request;
 
 $loader = require_once __DIR__.'/../app/bootstrap.php.cache';
 
-// Use APC for autoloading to improve performance.
-// Change 'sf2' to a unique prefix in order to prevent cache key conflicts
-// with other applications also using APC.
-/*
-$loader = new ApcClassLoader('sf2', $loader);
-$loader->register(true);
-*/
-
 require_once __DIR__.'/../app/AppKernel.php';
 //require_once __DIR__.'/../app/AppCache.php';