RFR: 8350263: JvmciNotifyBootstrapFinishedEventTest intermittently times out

[Doug Simon]

On Tue, 18 Feb 2025 14:11:04 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

> [JDK-8346781](https://bugs.openjdk.org/browse/JDK-8346781) changed `JVMCIServiceLocator` such that set of providers is computed eagerly in `JVMCIServiceLocator.<clinit>`. There are some JVMCI test classes that directly subclassed `JVMCIServiceLocator` which meant deadlock could occur between the main thread running the test and a JVMCI compiler thread. This PR fixes this by ensuring that `JVMCIServiceLocator` providers are separate classes from the main test class.

Thanks for the reviews.

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PR Comment: https://git.openjdk.org/jdk/pull/23679#issuecomment-2666659103