RFR: 8262046: Clean up parallel class loading code and comments [v2]

[Coleen Phillimore]

On Wed, 31 Mar 2021 23:55:47 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Since nobody wants to read this example in this comment and neither do I, I'm removing it.  Debugging this using -Xlog:class+load+placeholders=debug will show the stacking of placeholders that detect CCE.
>
> I guess it's OK to remove this comment, since most of us who have looked at this code in the past few years haven't found this comment to be helpful. Maybe you can add a comment about `-Xlog:class+load+placeholders=debug` instead?
> 
> If we do want to improve the comment, maybe we can replacing Base->Super with something like Car->Vehicle. That way it's clear which is the supertype.

Thanks Ioi.

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PR: https://git.openjdk.java.net/jdk/pull/3200