[Nestmates] RFR (S): Support access to VM annotations from nonfindable classes

[Lois Foltan]

Please review the following change as part of the ongoing prototyping 
work to support MethodHandle Lookup functionality to define a nestmate 
class.  In particular this fix allows access to VM annotations for 
nonfindable classes.

webrev: 
http://cr.openjdk.java.net/~lfoltan/wrk_nestLookupDefineClass_annotations.1/webrev/
bug: https://bugs.openjdk.java.net/browse/JDK-8171335

Thanks,
Lois