RFR: 8290059: Do not use std::thread in panama tests

Fri Jul 22 16:45:57 UTC 2022

On Thu, 21 Jul 2022 18:48:14 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> This patch removes the use of std::thread from the `java.lang.foreign` tests, and switches to the OS specific thread APIs, in order to change things such as the stack size on some platforms where this is required in the future (see the JBS issue).
> 
> This is done by adding a small header-only library that exposes a function to run code in freshly spawned threads (`run_async`).
> 
> Testing: Running the affected tests on platforms that implement the linker.

@JornVernee thanks for doing this so quickly. I suggest undoing https://github.com/openjdk/jdk/commit/d7f0de272c85ee8d0890c9d61e10065b618b69d7 in this change, too. If you update this PR I can run it through our Alpine test pipeline.

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PR: https://git.openjdk.org/jdk/pull/9599