The `RegisterFinalizersAtInit` option controls whether finalizers are registered after allocation or at return from the Object.<init> constructor. The default is to register at the end of Object.<init> and this has been the default for years.

We should remove the option and hardcode it always be true so finalizers can only be registered at the end of Object.<init>.

Continuing to support the flag is counter to the increased Integrity push [0] and will be increasingly problematic when Project Valhalla merges in due to allowing larval objects to escape before they are frozen.


[0] https://openjdk.org/jeps/8305968