Review CSR JDK-8266760: Remove sun.misc.Unsafe::defineAnonymousClass

[Mandy Chung]

Hidden classes were added in Java SE 15. Class data support was added in 
16. `sun.misc.Unsafe::defineAnonymousClass` was deprecated in JDK 15 and 
deprecated for terminally removal in JDK 16.

I propose to remove `sun.misc.Unsafe::defineAnonymousClass` from JDK 17:
CSR: https://bugs.openjdk.java.net/browse/JDK-8266760
Comments?

Mandy