[jdk19] RFR: 8289302: Restore CriticalJNINatives

[Coleen Phillimore]

On Wed, 29 Jun 2022 12:10:35 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This change restores the code in the JVM that implemented the internal JavaCritical or CriticalJNINatives functionality.  Customers are using this feature and there's no replacement yet for it.
> This change is a backout and merge of jDK-8258192: Obsolete the CriticalJNINatives flag.
> This change also adds the deprecation message that was missed, which I checked is okay with the customer.
> 
> Tested with tiers1-4.

Panama had this sort of functionality and didn't want to keep it. Hopefully they can answer.  They're working on satisfying the needs of this sort of customers, but until then, this is something that will prevent them from moving forward.

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

PR: https://git.openjdk.org/jdk19/pull/90