RFR: 8330846: Add stacks of mounted virtual threads to the HotSpot thread dump [v6]

[Inigo Mediavilla Saiz]

> 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:

  Add indentation for virtual thread stack

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19482/files
  - new: https://git.openjdk.org/jdk/pull/19482/files/12a41a54..6a3b779f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19482&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19482&range=04-05

  Stats: 7 lines in 2 files changed: 7 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19482.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19482/head:pull/19482

PR: https://git.openjdk.org/jdk/pull/19482