Merge branch '4.4' into 5.1

* 4.4:
  Enable "native_constant_invocation" CS rule
  Make AbstractPhpFileCacheWarmer public

Author: nicolas-grekas

function.php

@@ -22,6 +22,6 @@
      */
     function trigger_deprecation(string $package, string $version, string $message, ...$args): void
     {
-        @trigger_error(($package || $version ? "Since $package $version: " : '').($args ? vsprintf($message, $args) : $message), E_USER_DEPRECATED);
+        @trigger_error(($package || $version ? "Since $package $version: " : '').($args ? vsprintf($message, $args) : $message), \E_USER_DEPRECATED);
     }
 }