RFR: 8367689: Revert removal of several compilation-related vmStructs fields [v4]

[Kevin Walls]

On Thu, 18 Sep 2025 08:15:26 GMT, Francesco Andreuzzi <fandreuzzi at openjdk.org> wrote:

>> #23782 ([JDK-8315488](https://bugs.openjdk.org/browse/JDK-8315488)) removed several vmStructs fields. A small subset was used in Async-Profiler:
>> 
>> CiEnv* _env
>> CompileTask* _task
>> ciMethod* _method
>> 
>> 
>> I propose a small patch to bring them back. It helps third-party tools in building useful features on the JDK. For example, Async-Profiler uses these fields to display the current method being compiled in a compiler thread.
>
> Francesco Andreuzzi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   missing close

OK, thanks!

-------------

Marked as reviewed by kevinw (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27318#pullrequestreview-3238053151