[HttpKernel] backport FC compat code

Author: nicolas-grekas

Profiler/Profiler.php

@@ -138,10 +138,14 @@ public function find($ip, $url, $limit, $method, $start, $end, $statusCode = nul
     /**
      * Collects data for the given Response.
      *
+     * @param \Throwable|null $exception
+     *
      * @return Profile|null A Profile instance or null if the profiler is disabled
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
+        $exception = 2 < \func_num_args() ? func_get_arg(2) : null;
+
         if (false === $this->enabled) {
             return null;
         }