RFR: 8361647: Report the error reason on failed semaphore calls on macOS

[David Holmes]

On Wed, 9 Jul 2025 06:30:59 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Simple enhancement to report the reason for any failure when using the semaphore on macOS. This is to aid in diagnosing another failure.
> 
> Testing:
>  - tiers 1-3 sanity
>  - manually triggered a failure to check output (see JBS)
> 
> Thanks

Thanks for all the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/26212#issuecomment-3054981634