RFR: 8334223: Make Arena MEMFLAGs immutable [v2]

[Thomas Stuefe]

On Mon, 17 Jun 2024 10:08:49 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> This looks like a very good cleanup to me, thank you.

Thanks @jdksjolen !

I would like to have someone from the runtime team okay the changes to the thread constructors. Maybe @dholmes-ora ?

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PR Comment: https://git.openjdk.org/jdk/pull/19693#issuecomment-2173721837