[lworld] RFR: 8376122: [lworld] Cleanup of SA use of aconst_init and withfield

[Frederic Parain]

On Mon, 26 Jan 2026 13:40:51 GMT, Paul Hübner <phubner at openjdk.org> wrote:

> Hi all,
> 
> This PR removes leftover bytecode definitions in various places from older Valhalla models that we are no longer using in the virtual machine:
> * `aconst_init`
> * `withfield`
> 
> `Bytecodes.java` also had references to qworld codes that I cleaned up while I was in the area.
> * `qgetfield`
> * `qputfield`
> 
> The SA should now have bytecode-parity with mainline & the VM.
> 
> Testing: tiers 1-3.

LGTM

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Marked as reviewed by fparain (Committer).

PR Review: https://git.openjdk.org/valhalla/pull/1969#pullrequestreview-3713247528