minor #30779 Remove obsolete code (fabpot)

This PR was merged into the 4.3-dev branch.

Discussion
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Remove obsolete code

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

The bug referenced was fixed in 7.0 beta 3 (668ecaa606)

Commits
-------

8d25319783 removed obsolete code

src/Symfony/Component/HttpKernel/Kernel.php

@@ -826,7 +826,6 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
 
         $output .= $rawChunk;
 
-        // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
         unset($tokens, $rawChunk);
         gc_mem_caches();
 

src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php

@@ -60,7 +60,6 @@ class AnnotationFileLoader extends FileLoader
             $collection->addCollection($this->loader->load($class, $type));
         }
 
-        // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
         gc_mem_caches();
 
         return $collection;

src/Symfony/Component/Translation/Extractor/PhpExtractor.php

@@ -83,7 +83,6 @@ class PhpExtractor extends AbstractFileExtractor implements ExtractorInterface
         foreach ($files as $file) {
             $this->parseTokens(token_get_all(file_get_contents($file)), $catalog);
 
-            // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
             gc_mem_caches();
         }
     }