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/api/jerry-snapshot.c

@@ -168,7 +168,7 @@ snapshot_add_compiled_code (ecma_compiled_code_t *compiled_code_p, /**< compiled
     return 0;
   }
 
-  if (compiled_code_p->status_flags & CBC_CODE_FLAGS_CONSTRUCTOR)
+  if (compiled_code_p->status_flags & CBC_CODE_FLAGS_CLASS_CONSTRUCTOR)
   {
     globals_p->class_found = true;
   }

jerry-core/api/jerry.c

@@ -2782,7 +2782,7 @@ jerry_invoke_function (bool is_invoke_as_constructor, /**< true - invoke functio
     JERRY_ASSERT (jerry_value_is_constructor (func_obj_val));
 
     return jerry_return (ecma_op_function_construct (ecma_get_object_from_value (func_obj_val),
-                                                     ECMA_VALUE_UNDEFINED,
+                                                     ecma_get_object_from_value (func_obj_val),
                                                      args_p,
                                                      args_count));
   }