RFR: 8339148: Make os::Linux::active_processor_count() public

[Severin Gehwolf]

On Tue, 3 Sep 2024 10:16:06 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> Please review this Linux-only change which makes `os::Linux::active_processor_count()` public (from currently protected). This allows us to clean up some `friend class` usages and will also make some container related patches less clunky.
> 
> Testing:
> - [x] GHA
> - [x] Container tests on linux x86_64
> 
> Thoughts?

Thanks for the reviews! I'll integrate later today.

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PR Comment: https://git.openjdk.org/jdk/pull/20833#issuecomment-2328834735