[lworld] RFR: 8367792: [lworld] Remove the Unsafe remnants of old valhalla prototypes

[Chen Liang]

On Tue, 16 Sep 2025 22:08:30 GMT, Chen Liang <liach at openjdk.org> wrote:

> There are some remnants from previous iterations of value objects in Unsafe. We should aim to remove them for cleaner code in the future.

The vector support prototype was last updated 5 months ago. makePrivateBuffer introduces significant complexity into core library code and JVM. Besides this complexity, the vector prototype also introduces "multifield", which is also uncertain.

I will reach out to Paul Sandoz and Jatin Bhateja to check on the status of this prototype - it hasn't been updated since the new lworld model, maybe our mainline hacks can continue to work after the vector classes are marked value.

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PR Comment: https://git.openjdk.org/valhalla/pull/1593#issuecomment-3303831273