RFR: 8361404: Parallel: Group all class unloading logc at the end of marking phase

[Ivan Walulya]

On Fri, 4 Jul 2025 11:15:26 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple patch of moving some out-of-place `ClassLoaderDataGraph` logic to the end of marking-phase in order group all class unloading logic at the same scope/site.
> 
> Test: tier1-8

Marked as reviewed by iwalulya (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26130#pullrequestreview-3029161803