RFR: bad oop with JvmtiVTMSTransitionDisabler [v2]

[Alex Menkov]

> Bad oop can happen after JvmtiVTMSTransitionDisabler is installed (at java_lang_VirtualThread::carrier_thread(java_thread) call).
> Fixed by converting java_thread to Handle

Alex Menkov has updated the pull request incrementally with one additional commit since the last revision:

  fixed bad oop for name and snapshot

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

Changes:
  - all: https://git.openjdk.org/loom/pull/217/files
  - new: https://git.openjdk.org/loom/pull/217/files/15d07b2f..ddb8ad65

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=loom&pr=217&range=01
 - incr: https://webrevs.openjdk.org/?repo=loom&pr=217&range=00-01

  Stats: 30 lines in 3 files changed: 13 ins; 5 del; 12 mod
  Patch: https://git.openjdk.org/loom/pull/217.diff
  Fetch: git fetch https://git.openjdk.org/loom.git pull/217/head:pull/217

PR: https://git.openjdk.org/loom/pull/217