[13] RFR (S): 8213234: Move LambdaForm.Hidden to jdk.internal.vm.annotation

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8213234/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8213234

Move LambdaForm.Hidden to jdk.internal.vm.annotation, so it can be 
shared across JDK until a standard solution is provided [1].

Testing: tier1-2

Best regards,
Vladimir Ivanov

[1] https://bugs.openjdk.java.net/browse/JDK-8212620