8076543: Add @modules as needed to the langtools tests
Reviewed-by: jjg, shurailine

8031569: Refactor javac scope implementation to enable lazy imports
Summary: Introducing an internal API for Scope; rewriting ImportScopes to extend CompoundScopes.
Reviewed-by: mcimadamore, jjg, jfranck
Contributed-by: maurizio.cimadamore@oracle.com, jan.lahoda@oracle.com

7017664: Add listeners infrastracture to javac scopes
Summary: Add listeners to javac scopes, added CompoundScope and correct invalidation logic for ImplementationCache
Reviewed-by: jjg