[jdk19] RFR: 8287847: Fatal Error when suspending virtual thread after it has terminated [v8]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains ten additional commits since the last revision:

 - Merge branch 'master' of https://github.com/openjdk/jdk19 into 8287847_nb
   merge
 - provide a slightly more descriptive @summary
 - Add new SuspendAfterDeath test to jdk_jdi_sanity test group.
 - Always run test both in virtual and platform thread modes
 - No need to initialzie boolean to false.
 - Get rid of need to cast toArray() result to a String[]
 - fix indentation
 - fixed jcheck errors
 - Fix issue with suspending a virtual thread after it has terminated.

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

Changes:
  - all: https://git.openjdk.org/jdk19/pull/88/files
  - new: https://git.openjdk.org/jdk19/pull/88/files/bb35374e..17e4658e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk19&pr=88&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk19&pr=88&range=06-07

  Stats: 1123 lines in 39 files changed: 833 ins; 91 del; 199 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