RFR: 8262046: Clean up parallel class loading code and comments [v4]

[Coleen Phillimore]

On Thu, 1 Apr 2021 20:36:51 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add comment about logging placeholders.
>
> Thank you for the comments.

Thanks Ioi for reviewing.  I think the refactoring of the waiting loops will make it easier to work with if there is a subtle change in behavior.  I could add a conditional to the function instead of the duplicated code.
Thanks!

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