RFR: 8330846: Add stacks of mounted virtual threads to the HotSpot thread dump [v18]

[Alan Bateman]

On Wed, 12 Jun 2024 08:45:46 GMT, Inigo Mediavilla Saiz <duke at openjdk.org> wrote:

>> Print the stack traces of mounted virtual threads when calling `jcmd <pid> Thread.print`.
>
> Inigo Mediavilla Saiz has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove unneeded line

I've created [JDK-8334215](https://bugs.openjdk.org/browse/JDK-8334215) with issues found when trying to sync up the loom repo. The tests in that repo are typically run with JTREG_TEST_THREAD_FACTORY=Virtual and can tickle issue that we don't always see immediately in main line.

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PR Comment: https://git.openjdk.org/jdk/pull/19482#issuecomment-2165253546