RFR: 8363998: Implement Compressed Class Pointers for 32-bit [v3]

[Thomas Stuefe]

On Mon, 28 Jul 2025 15:18:53 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> Possibly; but I wanted to keep the change to a minimum. There will be a larger cleanup coming when UseCompressedClassPointers gets removed.
>
> ok

On closer inspection, this is still used in arm C1. I would like to keep the changes minimal, so I'll just keep it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26491#discussion_r2244526788