RFR: 8320522: Remove code related to `RegisterFinalizersAtInit` [v5]

[Albert Mingkun Yang]

On Thu, 18 Apr 2024 13:49:19 GMT, Dan Heidinga <heidinga at openjdk.org> wrote:

>> Remove the code related to -XX:[+-]RegisterFinalizersAtInit in JDK23.
>> 
>> `make test-tier1` passed with this change
>
> Dan Heidinga has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove unused variable

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18823#pullrequestreview-2009435625