RFR: JDK-8310066: Improve test coverage for JVMTI GetThreadState on carrier and mounted vthread [v3]

[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:

  spurious wakeups

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14622/files
  - new: https://git.openjdk.org/jdk/pull/14622/files/b5b39bcd..6c517cef

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14622&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14622&range=01-02

  Stats: 124 lines in 2 files changed: 88 ins; 0 del; 36 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