RFR: 8345580: Remove const from Node::_idx which is modified [v2]

[Emanuel Peter]

On Wed, 8 Jan 2025 14:45:33 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

>> Ok, just discussed it with some other engineers:
>> Please file a Follow-up RFE. Make `Node::_idx` private, and replace all uses with an accessor.
>
> You need 2 people with the reviewer role for this, not sure if it is the intention of @eme64

I am lowering it, @merykitty is quite competent at reviewing this :)

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PR Comment: https://git.openjdk.org/jdk/pull/22646#issuecomment-2577903214