RFR: JDK-8310066: Improve test coverage for JVMTI GetThreadState on carrier and mounted vthread [v6]

[Alex Menkov]

> This is follow-up JDK-8307153/JDK-8309612 (JVMTI GetThreadState on carrier should return STATE_WAITING)
> New test tests GetThreadState for different thread states.
> The test detected a bug in the implementation, new issue is created: JDK-8310584
> Corresponding testcases are commented now in the test, fix for JDK-8310584 will uncomment them

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

  updated comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14622/files
  - new: https://git.openjdk.org/jdk/pull/14622/files/04cec709..d9898865

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14622&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14622&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14622.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14622/head:pull/14622

PR: https://git.openjdk.org/jdk/pull/14622