RFR: 8323832: Load JVMCI with the platform class loader [v2]

[Alan Bateman]

On Wed, 24 Jan 2024 13:47:17 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

> You're right. I had forgotten the intricacies of class loader delegation. The only hard constraint on loading a class in multiple loaders is that `java.*` classes [must (only) be loaded by the boot loader](https://github.com/openjdk/jdk/blob/bccd823c8e40863bed70ff5b24772843203871a5/src/java.base/share/classes/java/lang/ClassLoader.java#L904).

Just to add that this restriction was relaxed in Java 9 to allow java.* classes be defined by the platform class loader. The code that is linked to here throws if the class loader is not the platform class loader. There isn't a user accessible ClassLoader object for the boot loader and testing `this == null` doesn't make sense.

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PR Comment: https://git.openjdk.org/jdk/pull/17520#issuecomment-1908375220