RFR 8222815 [lworld/lw2] : Attempts to serialize an inline type should throw NotSerializableException

[Chris Hegarty]

For LW2, we will not yet have support for serializing inline types.
Runtime attempts to serialize an inline type should throw
NotSerializableException.

Issue:
  https://bugs.openjdk.java.net/browse/JDK-8222815
Webrev:
  https://cr.openjdk.java.net/~chegar/valhalla/8222815/

-Chris.