RFR: 8340103: Add internal set_flag function to VMATree [v11]

[Johan Sjölen]

On Wed, 6 Nov 2024 10:21:21 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> But it is not uniform if we end up with three different initialization styles: the old way of `object(a, b, c);` the new way of `object{a, b, c};` and plain array/struct init, which  overwhelmingly seems to use spaces around curlies: `= { a, b, c };` .
>
> Yeah, I don't care too much about what we do here to be honest. If you want spaces around curlies, we can do that :).

I added a constructor and changed to parens!

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PR Review Comment: https://git.openjdk.org/jdk/pull/20994#discussion_r1830747809