[jdk25u] RFR: 8367689: Revert removal of several compilation-related vmStructs fields

[Aleksey Shipilev]

On Thu, 18 Sep 2025 08:33:52 GMT, Francesco Andreuzzi <fandreuzzi at openjdk.org> wrote:

> Clean backport, reverts the removal of two CI fields which may be used by external tools. Low risk and small change.
> 
> Passes tier1.

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk25u/pull/212#pullrequestreview-3245039295