RFR 8223351 [lworld/lw2] : Primary mirror and nullable mirror for inline type

[Roger Riggs]

Please review Mandy's additions and changes to reflection and 
java.lang.invoke APIs
for inline and nullable types.
The changes go a bit deep because of the support for the Java APIs 
provided by the VM.

This initial prototype reflects discussions about terminology and 
orthogonality
of concepts for inline vs nullable as described in the comments of 8223351.

Issue:
   https://bugs.openjdk.java.net/browse/JDK-8223351

Webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-lworld-dev-8223351/

Thanks for any comments and suggestions, Roger