RFR: 8341273: JVMTI is not properly hiding some continuation related methods [v8]

[Serguei Spitsyn]

> This fixes a problem in the VTMS (Virtual Thread Mount State) transition frames hiding mechanism.
> Please, see a fix description in the first comment.
> 
> Testing:
>  - Verified with new test `vthread/CheckHiddenFrames`
>  - Mach5 tiers 1-6 are passed

Serguei Spitsyn has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 11 commits:

 - Merge
 - review: explain better what methods can be annotated with JvmtiMountTransition
 - review: clarify the use of annotation @JvmtiMountTransition in yield/yield0
 - review: moved notifyJvmtiStart/notifyJvmtiEnd calls from VirtualThread.run to the caller
 - review: tweaked disabler for carrier threads; more hiddenjvmti_mount_transition frames
 - Disallow NotifyFramePop for enter/enter0/VirtualThread.run/VThreadContinuation.run
 - review: 1. Minor tweaks in new test; 2. Refactor skip_hidden_frames in two
 - fix one more place with trailing spaces
 - fix trailing spaces
 - add new test coverage with  vthread/CheckHiddenFrames
 - ... and 1 more: https://git.openjdk.org/jdk/compare/d6eddcda...54dc2b4a

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Changes: https://git.openjdk.org/jdk/pull/21397/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21397&range=07
  Stats: 282 lines in 11 files changed: 236 ins; 18 del; 28 mod
  Patch: https://git.openjdk.org/jdk/pull/21397.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21397/head:pull/21397

PR: https://git.openjdk.org/jdk/pull/21397