RFR: 8285196: Deadlock reporting prints carrier thread when virtual thread is in deadlock cycle [v2]

[Ron Pressler]

> Do not detect deadlock cycles, be it for monitors only or j.u.c `OwnableSynchronizer`s, when virtual threads are involved in the cycle.

Ron Pressler has updated the pull request incrementally with one additional commit since the last revision:

  fix

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

Changes:
  - all: https://git.openjdk.java.net/loom/pull/173/files
  - new: https://git.openjdk.java.net/loom/pull/173/files/026f0e43..4268825d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=loom&pr=173&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=loom&pr=173&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/loom/pull/173.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/173/head:pull/173

PR: https://git.openjdk.java.net/loom/pull/173