Remove dead code

Author: staabm

bin/phpstan

@@ -13,15 +13,6 @@ use Symfony\Component\Console\Helper\ProgressBar;
 (function () {
 	error_reporting(E_ALL);
 	ini_set('display_errors', 'stderr');
-	if (version_compare(PHP_VERSION, '7.4.0', '<')) {
-		// PHP earlier than 7.4.x with OpCache triggers a bug when we intercept
-		// custom autoloaders' reads to discover file paths. See PHPStan #4881.
-		ini_set('opcache.enable', 'Off');
-	}
-
-	if (PHP_VERSION_ID < 70300) {
-		gc_disable(); // performance boost
-	}
 
 	define('__PHPSTAN_RUNNING__', true);