In MySQL 8.0, WL#7488 is one of the tasks that is related to the Global Data Dictionary. The text is a broader description of the InnoDB startup.
What was actually implemented in MySQL 8.0.0 is some improved InnoDB startup parameter validation. All parameters are validated before InnoDB actually accesses any data files.
While in MariaDB we might still perform the full InnoDB startup and recovery in the plugin_init function, it is good to merge the applicable part of the changes from 8.0.