RFR: 8298853: JvmtiVTMSTransitionDisabler should support disabling one virtual thread transitions [v7]

[Serguei Spitsyn]

> Now the `JvmtiVTMSTransitionDisabler` mechanism supports disabling VTMS transitions for all virtual threads only. It should also support disabling transitions for any specific virtual thread as well. This will improve scalability of the JVMTI functions operating on target virtual threads as the functions can be executed concurrently without blocking each other execution when target virtual threads are different.
> New constructor `JvmtiVTMSTransitionDisabler(jthread vthread)` is added which has jthread parameter of the target virtual thread.
> 
> Testing:
>   mach5 jobs are TBD (preliminary testing was completed):
>    - all JVMTI, JDWP, JDI and JDB tests have to be run
>    - Kitchensink
>    - tier5

Serguei Spitsyn has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains eight commits:

 - Merge branch 'master' into br21
 - minor comments are resolved
 - fix race between VTMS_transition_disable_for_one and start_VTMS_transition
 - use owned_by_self vs is_locked in JvmtiVTMSTransition_lock asserts
 - address wqsecond round review comments
 - review comments are addressed
 - fix trailing white spaces in javaClasses.cpp and jvmtiThreadState.cpp
 - 8298853: JvmtiVTMSTransitionDisabler should support disabling one virtual thread transitions

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

Changes: https://git.openjdk.org/jdk/pull/11690/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11690&range=06
  Stats: 198 lines in 8 files changed: 129 ins; 16 del; 53 mod
  Patch: https://git.openjdk.org/jdk/pull/11690.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11690/head:pull/11690

PR: https://git.openjdk.org/jdk/pull/11690