RFR: 8257967: JFR: Events for loaded agents [v16]

[Markus Grönlund]

On Thu, 13 Apr 2023 10:07:50 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

> What was the reason to clone the classes below ?: `JvmtiJavaThreadEventTransition` => `AgentJavaThreadEventTransition` `JvmtiThreadEventMark` => `AgentThreadEventMark` `JvmtiEventMark` => `AgentEventMark`

The reason is they are used when invoking Agent_OnAttach. Those classes are defined in jvmtiExport.cpp, so not reachable. I considered exporting them, but it would require additional headers to be included. I opted for just replicating them, also with static linkage.

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PR Comment: https://git.openjdk.org/jdk/pull/12923#issuecomment-1506825122