Request for review (L): 6839872: remove implementation inheritance from JSR 292 APIs

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/6839872/webrev.01/

6839872: remove implementation inheritance from JSR 292 APIs
Summary: Move all JSR 292 classes into the java.dyn package.
Reviewed-by:

Initial versions (including the preview in 7/M3) of the JSR 292 API
use an undesirable technique for data structure factoring,
implementation inheritance.  The types MethodHandle and
JavaMethodHandle both inherit from JVM-internal supertypes.

The solution is to remove those private supertypes from those public
types.

This is the JVM part of 6839872.  It adds support to the JVM to handle
both namespaces, java.dyn/sun.dyn and java.dyn only.

The support for the old namespace (AllowTransitionalJSR292) will be
removed as soon as the related JDK changes appear in the
repositories.