RFR: 8282384: [LOOM] Need test for ThreadReference.interrupt() on a vthread [v4]

[Chris Plummer]

> Convert this ThreadReference.interrupt() test to support virtual threads. I believe this is the only test for ThreadReference.interrupt() that we have.
> 
> Tested by running with and without -Dmain.wrapper=Virtual on all supported platforms.

Chris Plummer has updated the pull request incrementally with one additional commit since the last revision:

  update comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13696/files
  - new: https://git.openjdk.org/jdk/pull/13696/files/a7f277a9..d2ee0c31

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13696&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13696&range=02-03

  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13696.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13696/head:pull/13696

PR: https://git.openjdk.org/jdk/pull/13696