[lworld] RFR: 8371357: [lworld] Remove EnableValhalla

[David Holmes]

On Fri, 12 Dec 2025 16:07:09 GMT, Paul Hübner <phubner at openjdk.org> wrote:

> is_valhalla_enabled

As Ioi suggested in the mainline argument.hpp PR shouldn't this be something more specific to what is actually being enabled in this preview release e.g. valueTypesConfig.hpp which defines `value_types_enabled` or some such?  IIUC for this release we are talking about JEP-401 features that are opted into when `--enable-preview` is added. But for the next release I assume there could be additional JEPs with 401 still also in preview - so `is_valhalla_enabled` is somewhat vague and doesn't identify what aspect of Valhalla a piece of code relates to.

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PR Comment: https://git.openjdk.org/valhalla/pull/1759#issuecomment-3653729866