[VarDumper] Allow dd() to be called without arguments

src/Symfony/Component/VarDumper/Resources/functions/dump.php

@@ -32,14 +32,12 @@ if (!function_exists('dump')) {
 }
 
 if (!function_exists('dd')) {
-    function dd($var, ...$moreVars)
+    function dd(...$vars)
     {
-        VarDumper::dump($var);
-
-        foreach ($moreVars as $v) {
+        foreach ($vars as $v) {
             VarDumper::dump($v);
         }
 
-        exit(1);
+        die(1);
     }
 }