Merge branch '4.4' into 5.1

* 4.4:
  [Intl] promote warnings to value errors on PHP 8
  Fix CS
  DateTime validator support for trailing data
  Remove some leftover for HHVM support
  Simplify code
  Fix tests on 5.6
  [Debug] Skip a test that was meant for HHVM.
  [Console] Silence warnings on sapi_windows_cp_set() call
  guard $argv + $token against null, preventing unnecessary exceptions

Author: xabbuh

Tests/Session/Storage/NativeSessionStorageTest.php

@@ -194,10 +194,6 @@ public function testCookieOptions()
 
     public function testSessionOptions()
     {
-        if (\defined('HHVM_VERSION')) {
-            $this->markTestSkipped('HHVM is not handled in this test case.');
-        }
-
         $options = [
             'url_rewriter.tags' => 'a=href',
             'cache_expire' => '200',