RFR: 8295673: Deprecate legacy parallel class loading workaround for non-parallel-capable class loaders

[Coleen Phillimore]

On Sun, 6 Nov 2022 21:54:46 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> If you want, it seemed unnecessary clutter for the assert. And it's really only necessary for non null class loader data
>
> I'd like to understand how the assert connects to the changes.

Multiple threads can now create the LOAD_INSTANCE placeholder for the same class in the case of non-parallel capable class loader, so this assert is no longer valid for this case.

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PR: https://git.openjdk.org/jdk/pull/10832