RFR: 8333542: Breakpoint in parallel code does not work

[Coleen Phillimore]

On Mon, 17 Jun 2024 17:58:14 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> Revert the change for JDK-8288064 "Class initialization locking".  JVMTI class prepare event relies on a lock being held through setting the state of the class to 'linked' and the JVMTI event posting. The only usable lock is the Java object init_lock, which was removed.  This change restores the lock and fixes all the conflicts in code that's changed since.
> 
> Tested with tier1-7.

Thanks David and Vladimir for the reviews, and Chris for the report, test and testing.

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PR Comment: https://git.openjdk.org/jdk/pull/19755#issuecomment-2189849784