Rework the core of class parsing/runtime semantic (#3598)

Changes:
 - Use the pre-scanner to provide information for the parser about the existence of the class constructor
 - The allocation of the super declarative environment is no longer needed
 - The VM frame context holds the information about the this binding status
 - Reduce the number of class related VM/CBC instructions
 - Improve ecma_op_function_{construct, call} to properly set new.target

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

jerry-core/ecma/builtin-objects/ecma-builtin-helpers-error.c

@@ -60,12 +60,10 @@ ecma_builtin_helper_error_dispatch_call (ecma_standard_error_t error_type, /**<
     ecma_deref_ecma_string (message_string_p);
     return ecma_make_object_value (new_error_object_p);
   }
-  else
-  {
-    ecma_object_t *new_error_object_p = ecma_new_standard_error (error_type);
 
-    return ecma_make_object_value (new_error_object_p);
-  }
+  ecma_object_t *new_error_object_p = ecma_new_standard_error (error_type);
+
+  return ecma_make_object_value (new_error_object_p);
 } /* ecma_builtin_helper_error_dispatch_call */
 
 /**