RFR: 8349689: Several virtual thread tests missing /native keyword [v3]

[SendaoYan]

On Tue, 11 Feb 2025 09:00:46 GMT, SendaoYan <syan at openjdk.org> wrote:

>> Can you remove this change from the PR as it this is a separate discussion? My guess is that in your environment the Thread.yield is somehow taking more than 5 seconds, is that right? In that case, we can modify the test to use a latch to ensure that it loops at least once. Anyway, separate issue, we shouldn't include it in this PR.
>
> Okey, the additional check has been removed.

I have created a separate [issue](https://bugs.openjdk.org/browse/JDK-8349787) to record that. I will investigate later.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23550#discussion_r1950471694