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-exceptions.c

@@ -137,8 +137,6 @@ ecma_new_standard_error (ecma_standard_error_t error_type) /**< native error typ
                                                        sizeof (ecma_extended_object_t),
                                                        ECMA_OBJECT_TYPE_CLASS);
 
-  ecma_deref_object (prototype_obj_p);
-
   ((ecma_extended_object_t *) new_error_obj_p)->u.class_prop.class_id = LIT_MAGIC_STRING_ERROR_UL;
 
 #ifdef JERRY_ENABLE_LINE_INFO