RFR: 8366122: Shenandoah: Implement efficient support for object count after gc events [v2]

[pf0n]

On Thu, 4 Sep 2025 00:12:48 GMT, Y. Srinivas Ramakrishna <ysr at openjdk.org> wrote:

>> I had an error in GHA during my early implementation, so I included that header. I'll remove and test to see if it is needed or not.
>
> I believe you need it for this: https://github.com/pf0n/jdk/blob/f43e334bf76f878ec688cbd58a5ab1cb10deb0f9/src/hotspot/share/memory/heapInspection.hpp#L218
> 
> It probably happens to work at other places because of preceding includes that happen to satisfy this. Explicitly including it here makes sense for that reason. Not sure why it just started showing up, but likely a new use that didn't otherwise satisfy this include.

I forgot to circle back on this, but there are files that I created that includes `heapInspection.hpp`. I get an incomplete type for the Mutex class if I don't include `mutex.hpp`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26977#discussion_r2320521485