RFR: 8315061: Make LockingMode a product flag

[David Holmes]

On Wed, 30 Aug 2023 19:36:45 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

> A trivial fix to make LockingMode a product flag.

It can be confusing to refer to experimental and diagnostic flags as "product" flags, in the sense that they are not "develop" flags, but they are not a full-fledged "product flag" which is a non-develop flag that is neither experimental nor diagnostic. We refer to the latter simply as "product flags".

By making this a product flag we also potentially increase the size of the user base that might be willing to test the new locking mode in their systems. We need to have some confidence that the new code has actually been used outside OpenJDK development and testing before making it the default for everyone. This change to full product flag is a necessary, but not in itself sufficient, step towards that.

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PR Comment: https://git.openjdk.org/jdk/pull/15496#issuecomment-1699951623