8193213: Make the UseAppCDS option obsolete. 8182731: Odd handling of -XX:-UseAppCDS and -XX:SharedArchiveFile. Summary: Application class data sharing is enabled without -XX:+UseAppCDS. SharedArchiveFile is now a product flag. Reviewed-by: dholmes, ihse, erikj, ccheung

8202284: FileChannel and FileOutpuStream variants of AtomicAppend should fail silently on macOS >= 10.13 Reviewed-by: chegar