RFR: 8315061: Make LockingMode a product flag

[Daniel D. Daugherty]

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 was an "experimental" product flag and many customers won't use experimental
product flags. We see similar push back on "diagnostic" product flags, but sometimes
customers are willing to _temporarily_ use a diagnostic flag in their production setups
to help us diagnose a failure that only happens in production.

I hope all this clarifies why I had to change LockingMode to a straight product flag.

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PR Comment: https://git.openjdk.org/jdk/pull/15496#issuecomment-1699904230