Fix template memory leak when debugger is running (#4572)

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/debugger/do_next.js

@@ -14,15 +14,29 @@
 
 print("next test");
 
-print ("var cat");
-var cat = 'cat';
-
 function test()
 {
   function f()
   {
     return 0;
   }
+
+  print("Func");
+  return f;
 }
 
-test();
+var f = test(),
+    g,
+    h = f();
+
+{
+  let a = test(),
+      b,
+      c = a();
+}
+
+
+eval("(function () {} `a`)")
+gc();
+
+f();