RFR: 8350753: Deprecate UseCompressedClassPointers [v5]

[David Holmes]

On Tue, 8 Apr 2025 05:23:20 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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision:
> 
>  - Test fix for 32-bit
>  - Merge branch 'master' into JDK-8350753-Deprecate-UseCompressedClassPointers
>  - move line
>  - move line
>  - Merge branch 'master' into JDK-8350753-Deprecate-UseCompressedClassPointers
>  - Merge branch 'openjdk:master' into JDK-8350753-Deprecate-UseCompressedClassPointers
>  - not on 32-bit
>  - Deprecate UseCompressedClassPointers

Marked as reviewed by dholmes (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24436#pullrequestreview-2751818316