RFR: 8338064: Give better error for ConcurrentHashTable corruption [v2]

[David Holmes]

On Thu, 8 Aug 2024 15:36:08 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> You get this message if the nodes of the concurrent hash table are corrupted or somehow don't yield the same hashcode as when the node was entered in the table.  This change makes the error message less obscure, and in debug mode compares the two hash codes.  The hash code is kept in the table in only debug mode, because we don't want the table to take a lot more memory.
>> Tested with tier1-4.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   A bit less repetative message.

Looks good. Thanks

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Marked as reviewed by dholmes (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20503#pullrequestreview-2229115800