fixed profiler unicity when several ones are registered

CHANGELOG

@@ -1,6 +1,6 @@
 * 1.35.2 (2018-XX-XX)
 
- * n/a
+ * fixed a regression in the way the profiler is registered in templates
 
 * 1.35.1 (2018-03-02)
 

lib/Twig/Profiler/NodeVisitor/Profiler.php

@@ -55,7 +55,7 @@ class Twig_Profiler_NodeVisitor_Profiler extends Twig_BaseNodeVisitor
 
     private function getVarName()
     {
-        return sprintf('__internal_%s', hash('sha256', __METHOD__));
+        return sprintf('__internal_%s', hash('sha256', $this->extensionName));
     }
 
     public function getPriority()