JSR 292 Polymorphic Annotations, these will no longer be necessary and needs
to be removed from the langtools repository.
The important things to remove are the transitional references to the "java.dyn" package, which won't exist in the OpenJDK sources after about jdk7-b136.

The annotations are an internal implementation feature. They need to stay at least through the JSR 292 review period, in case a decision is taken to change the invoke names. Put another way, the invoke names must not be hardwired into javac.