RFR: 8268349: Provide more detail in JEP 411 warning messages

[Weijun Wang]

On Tue, 8 Jun 2021 06:41:11 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> > You might want to make your "WARNING" consistent with the VM's "Warning" so that OutputAnalyzer's logic to ignore warnings will automatically ignore these too.
> 
> The uppercase "WARNING" is intentional here, it was the same with illegal reflective access warnings. I'm sure Max has or will run all tests to see if there are any issues.

Will definitely run all from tier1-tier9. I ran them multiple times while implementing JEP 411.

I've seen warnings with "VM" word in the prefix and test methods that filter them out, but feel the warnings here are not related to VM. The new warnings do have impacts on some tests and I'll be very carefully not break them.

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PR: https://git.openjdk.java.net/jdk/pull/4400