RFR: 8330748: ByteArrayOutputStream.writeTo(OutputStream) pins carrier [v3]

[Brian Burkhalter]

> Prevent blocking due to a carrier thread not being released when `ByteArrayOutputStream.writeTo` is invoked from a virtual thread.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8330748: Add vthread1.join() in test

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18901/files
  - new: https://git.openjdk.org/jdk/pull/18901/files/57e4917b..1dd59b7b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18901&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18901&range=01-02

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18901.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18901/head:pull/18901

PR: https://git.openjdk.org/jdk/pull/18901