RFR: 8291457: Clean up lifecycle of CDS dump-time data structures [v2]

[Ioi Lam]

On Thu, 4 Aug 2022 15:11:44 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   moved maybe_increment_refcount() to Symbol class; added comments about the need for deep copy
>
> Looks good. Thanks for the comment.

Thanks to @coleenp and @calvinccheung for the review.

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PR: https://git.openjdk.org/jdk/pull/9722