RFR: 8341273: JVMTI is not properly hiding some continuation related methods [v3]

[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 incrementally with one additional commit since the last revision:

  Disallow NotifyFramePop for enter/enter0/VirtualThread.run/VThreadContinuation.run

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21397/files
  - new: https://git.openjdk.org/jdk/pull/21397/files/8ec7bd3f..3317ea81

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21397&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21397&range=01-02

  Stats: 14 lines in 2 files changed: 8 ins; 5 del; 1 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