RFR: 8306028: separate ThreadStart/ThreadEnd events posting code in JVMTI VTMS transitions [v3]

[Serguei Spitsyn]

On Wed, 19 Apr 2023 22:02:20 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

>> This refactoring to separate ThreadStart/ThreadEnd events posting code in the JVMTI VTMS transitions is needed for future work on JVMTI scalability and performance improvements. It is to easier put this code on slow path.
>> 
>> Testing: mach5 tiers 1-6 were successful.
>
> Serguei Spitsyn has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Merge
>  - 8304444: Reappearance of NULL in jvmtiThreadState.cpp
>  - 8306028: separate ThreadStart/ThreadEnd events posting code in JVMTI VTMS transitions

Added update with refactoring prepared by @pchilano .
This update includes some renaming to make function names more consistent.
The mach5 runs of tiers 1-6 are all passed.

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PR Comment: https://git.openjdk.org/jdk/pull/13484#issuecomment-1524617260