bug #18436 fix Autowiring tests of #18144 (HeahDude)

This PR was merged into the 3.1-dev branch.

Discussion
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fix Autowiring tests of #18144

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| Tests pass?   | yes
| Fixed issue | symfony/symfony#18422 (comment)
| License       | MIT

Commits
-------

0cbf04a [DI] fix Autowiring tests of #18144

Author: fabpot

Config/AutowireServiceResource.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Config;
 
 use Symfony\Component\Config\Resource\SelfCheckingResourceInterface;
+use Symfony\Component\DependencyInjection\Compiler\AutowirePass;
 
 class AutowireServiceResource implements SelfCheckingResourceInterface, \Serializable
 {
@@ -32,7 +33,19 @@ public function isFresh($timestamp)
             return false;
         }
 
-        return @filemtime($this->filePath) <= $timestamp;
+        // has the file *not* been modified? Definitely fresh
+        if (@filemtime($this->filePath) <= $timestamp) {
+            return true;
+        }
+
+        try {
+            $reflectionClass = new \ReflectionClass($this->class);
+        } catch (\ReflectionException $e) {
+            // the class does not exist anymore!
+            return false;
+        }
+
+        return (array) $this === (array) AutowirePass::createResourceForClass($reflectionClass);
     }
 
     public function __toString()