RFR: 8340103: Add internal set_flag function to VMATree [v8]

[Johan Sjölen]

On Fri, 27 Sep 2024 09:42:10 GMT, Afshin Zafari <azafari at openjdk.org> wrote:

>> Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   out_state and in_state accessors
>
> Still looks good to me. Thanks

@afshin-zafari , @gerard-ziemski 

Please re-review this PR. I've added an early-return if the range isn't found.

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PR Comment: https://git.openjdk.org/jdk/pull/20994#issuecomment-2435004342