8177530: Module system implementation refresh (4/2017)Reviewed-by: lfoltan, sspitsynContributed-by: alan.bateman@oracle.com, harold.seigel@oracle.com, mandy.chung@oracle.com
8173393: Module system implementation refresh (2/2017)Reviewed-by: lfoltan, acorn, mchungContributed-by: alan.bateman@oracle.com, george.triantafillou@oracle.com
8156871: Possible concurrency issue with JVM_AddModuleExportsSummary: Need for single PackageEntry flag to determine a package's unqualifed export state.Reviewed-by: acorn, ctornqvi, dholmes, jiangli