RFR: 8350753: Deprecate UseCompressedClassPointers [v6]

[Coleen Phillimore]

On Wed, 9 Apr 2025 05:16:00 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Deprecates UseCompressedClassPointers. For the lengthy description of why and how we do this, please read the lengthy [CSR](https://bugs.openjdk.org/browse/JDK-8350754).
>> 
>> Testing:
>> 
>> I ran all jtreg tests manually on Linux-x64 that used the flag in some form (55 tests) to ensure they don't trip over the added deprecation output.
>> 
>> I also tested the JVM on arm32 to verify that UseCompressedClassPointers had never been available there, and that we don't start printing a confusing deprecation message now.
>
> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix whitespaces

Re-reviewed.

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Marked as reviewed by coleenp (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24436#pullrequestreview-2753271897