[jdk19] RFR: 8287847: Fatal Error when suspending virtual thread after it has terminated [v9]

[Chris Plummer]

> This fixes a bug in the debug agent when there is a request to suspend a virtual thread that has already terminated. The issue was that unless the debug agent was currently under a "suspend all", it would not properly put the virtual thread on the `otherThreads` list, and instead added it to `runningVThreads`. This meant at the end of `insertThread()` the following code tried to do a JVMTI `SetThreadLocalStorage`, which can't be done on a terminated thread.
> 
> 
>         if (list != &otherThreads) {
>             setThreadLocalStorage(node->thread, (void*)node);
>         }

Chris Plummer has updated the pull request incrementally with one additional commit since the last revision:

  Rename thread to targetThread. Verify targetThread state when the thread dies and when the breakpoint after the join() is reached.

-------------

Changes:
  - all: https://git.openjdk.org/jdk19/pull/88/files
  - new: https://git.openjdk.org/jdk19/pull/88/files/17e4658e..1ff59060

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk19&pr=88&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk19&pr=88&range=07-08

  Stats: 21 lines in 1 file changed: 13 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jdk19/pull/88.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/88/head:pull/88

PR: https://git.openjdk.org/jdk19/pull/88