RFR: 8367981: Update CompactHashtable comments [v2]

[Hamlin Li]

On Tue, 23 Sep 2025 16:53:25 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> All parameters of offset should be changed to encoded_value.

I guess you mean change from `value` to encoded_value in `CompactHashtable`?
I did not touch the parameter name `offset` in read_value_from_compact_hashtable (which is used in OffsetCompactHashtable), as I think it means `offset` intentionally.
But please correct me if I'm understanding wrongly.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27360#discussion_r2373145523