8062348: langtools tests should close file manager (group 1)
Reviewed-by: darcy

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

6943119: Rebrand source copyright notices
Reviewed-by: darcy

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