8149925: We don't need jdk.internal.ref.Cleaner any more - part1
Summary: 1st part of removing legacy jdk.internal.ref.Cleaner
Reviewed-by: chegar, mchung

8140606: Update library code to use internal Unsafe
Reviewed-by: alanb, mchung, psandoz, weijun

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com