RFR: 8341273: JVMTI is not properly hiding some continuation related methods [v10]

[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:

  review: undo minor tweaks in a couple of continuation related files

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21397/files
  - new: https://git.openjdk.org/jdk/pull/21397/files/58ab0057..5d6e5c91

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21397&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21397&range=08-09

  Stats: 5 lines in 2 files changed: 4 ins; 1 del; 0 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