RFR: JDK-8276422 Add command-line option to disable finalization [v3]

[Mandy Chung]

On Thu, 18 Nov 2021 20:05:15 GMT, Stuart Marks <smarks at openjdk.org> wrote:

>> Pretty much what it says. The new option controls a static member in InstanceKlass that's consulted to determine whether the finalization machinery is activated for instances when a class is loaded. A new native method is added so that this state can be queried from Java. This is used to control whether a finalizer thread is created and to disable the `System` and `Runtime::runFinalization` methods. Includes tests for the above.
>> 
>> Adding an option to disable finalization is part of [JEP 421](https://openjdk.java.net/jeps/421).
>
> Stuart Marks has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Rename InstanceKlass::finalization_enabled to is_finalization_enabled. Minor cleanups.

When the finalization is disabled, perhaps jcmd GC.finalizer_info should just be made as a nop in the VM.

-------------

PR: https://git.openjdk.java.net/jdk/pull/6442