RFR: 8353225: Add a way to iterate Klass inside the loaded CDS archive

[Ioi Lam]

On Tue, 1 Apr 2025 18:01:01 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> I'm confused by this.  next_link is the next link in the ClassLoaderData klasses list.  Why is this in LambdaProxyClassDictionary?
>
> This PR only moves code around, at least here. I am unsure why this code uses next_link. My understanding from reading the code and from Ioi's explanation is that LambdaProxyClassDictionary re-uses the next_link linking mechanism for linking CDS proxy classes together before they are loaded; so they are not yet part of the CLDG and this use does not conflict with the use of next_link in the CLDG. 
> 
> I may be wrong though and am happy to be corrected.

If we want this PR to proceed we should restructure the CDS code to use a different mechanism to iterate over the unloaded proxy classes.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24311#discussion_r2023435083