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/operations/ecma-lex-env.h

@@ -66,6 +66,25 @@ ecma_value_t ecma_op_implicit_this_value (ecma_object_t *lex_env_p);
 /* ECMA-262 v5, Table 18. Additional methods of Declarative Environment Records */
 void ecma_op_create_immutable_binding (ecma_object_t *lex_env_p, ecma_string_t *name_p, ecma_value_t value);
 
+#if ENABLED (JERRY_ES2015)
+void ecma_op_initialize_binding (ecma_object_t *lex_env_p, ecma_string_t *name_p, ecma_value_t value);
+
+void
+ecma_op_init_this_binding (ecma_object_t *lex_env_p, ecma_value_t this_binding);
+
+ecma_property_t *
+ecma_op_get_this_property (ecma_object_t *lex_env_p);
+
+bool
+ecma_op_this_binding_is_initialized (ecma_property_t *prop_p);
+
+ecma_value_t
+ecma_op_get_this_binding (ecma_object_t *lex_env_p);
+
+void
+ecma_op_bind_this_value (ecma_property_t *prop_p, ecma_value_t this_binding);
+#endif /* ENABLED (JERRY_ES2015) */
+
 /**
  * @}
  * @}