Investigate JEP 394: Pattern Matching for instanceof

[tgodzik]

JEP 394 introduced Pattern Matching for instanceof. Since we are planning to update to a newer JDK at an unspecified future I hope we can figure out if this is in any way useful to use for example for some bytecode optimization similar to #22249

And if we can actually use them or whether it will be impossible for us.

Introduced in JDK 15

[sjrd]

It doesn't seem like this JEP introduced any new byte code. So I believe there is nothing to take advantage of, here.

[He-Pin]

introduce a typeswitch in lambda factory.
java.lang.runtime.SwitchBootstraps#typeSwitch since Java 21