[lworld] RFR: 8378672: [lworld] Consolidate a factory to create a GraphKit from a SafePointNode [v2]

[Tobias Hartmann]

On Wed, 25 Feb 2026 13:30:15 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

>> Hi,
>> 
>> I find it is a common occurrence that we want to expand a `SafePointNode` into a subgraph, and to do that we may need to create a `JVMState` ourselves, which may easily results in cumbersome errors because the kit state is not created properly. I tried using `GraphKit` to expand generate code after a `SafePointNode` (in particular, I tried to emit an uncommon trap there), which leads to this PR which consolidates the creation of a `GraphKit` from a `SafePointNode` that we want to use its debug state.
>> 
>> Please take a look and leave your reviews, thanks a lot.
>
> Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Collateral damage

Looks good to me!

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Marked as reviewed by thartmann (Committer).

PR Review: https://git.openjdk.org/valhalla/pull/2163#pullrequestreview-3854348471