RFR: 6810: Create treemap viewer for JOverflow [v9]

[Kangcheng Xu]

On Thu, 25 Jun 2020 18:30:20 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Personally I'd prefer to have them removed.
>
> Or added as a proper comment with the reasoning for them being package private...
> 
> /*
>  * This method is package private since ClassX needs to access the internal state without having to do a defensive copy
>    every time, but we don't want to have it exposed in the public API since blahblahblah.
> */

> Personally I'd prefer to have them removed.

All `/* package-private */` comments are removed in commit aaaab0b.

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PR: https://git.openjdk.java.net/jmc/pull/77