Reduce ecma_{ref, deref}_object calls while using ecma_builtin_get (#2616)

The following stucture was highly frequented in the code base:

 - Get a builtin object // This operation increases the reference count of the object
 - Use it for create a new object
 - Deref the builtin object

After a builtin has been instantiated there is always at least one reference to "keep it alive",
so increase/decrease the reference count for getting the value only is unnecessary.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

jerry-core/ecma/operations/ecma-objects-general.c

@@ -62,11 +62,7 @@ ecma_op_create_object_object_noarg (void)
   ecma_object_t *object_prototype_p = ecma_builtin_get (ECMA_BUILTIN_ID_OBJECT_PROTOTYPE);
 
   /* 3., 4., 6., 7. */
-  ecma_object_t *obj_p = ecma_op_create_object_object_noarg_and_set_prototype (object_prototype_p);
-
-  ecma_deref_object (object_prototype_p);
-
-  return obj_p;
+  return ecma_op_create_object_object_noarg_and_set_prototype (object_prototype_p);
 } /* ecma_op_create_object_object_noarg */
 
 /**