RFR: 8361325: Refactor ClassLoaderExt [v2]

[Coleen Phillimore]

On Thu, 3 Jul 2025 17:12:55 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> After the refactoring work done via [JDK-8280682](https://bugs.openjdk.org/browse/JDK-8280682), there are only three functions remaining in the ClassLoaderExt class. This RFE is to move those remaining functions into other classes so that the ClassLoaderExt class can be eliminated.
>> 
>> Testing: passed tiers 1 - 5.
>
> Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:
> 
>   @coleenp comment

Marked as reviewed by coleenp (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26110#pullrequestreview-2984015341