bug symfony#26000 Fixed issue symfony#25985 (KevinFrantz)

This PR was merged into the 3.4 branch.

Discussion
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Fixed issue symfony#25985

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | yes/no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#25985
| License       | MIT

Oppress Zend OPcache API - ContextErrorException

Commits
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acb1cad Fixed issue symfony#25985

Author: fabpot

src/Symfony/Component/Debug/DebugClassLoader.php

@@ -141,7 +141,7 @@ public function loadClass($class)
             if ($this->isFinder && !isset($this->loaded[$class])) {
                 $this->loaded[$class] = true;
                 if ($file = $this->classLoader[0]->findFile($class) ?: false) {
-                    $wasCached = \function_exists('opcache_is_script_cached') && opcache_is_script_cached($file);
+                    $wasCached = \function_exists('opcache_is_script_cached') && @opcache_is_script_cached($file);
 
                     require $file;