RFR: 8249080 - Reduce MemberName class dependency on MethodHandles

[Bob Vandette]

Please review this RFE for JDK 16 that reduces a class dependency in the MethodHandles.Lookup class.

The ensureInitialized method from MethodHandles.Lookup creates a transient MemberName object only
to be used to throw an exception. This exception can be created in a more efficient manner without
using this class reducing the number of classes required. This reduction in dependencies is beneficial
to the GraalVM native-image tool and will be useful for future Leyden native image implementations. 

RFE:

https://bugs.openjdk.java.net/browse/JDK-8249080

WEBREV:

http://cr.openjdk.java.net/~bobv/8249080/webrev.01/

Bob.