RFR: 8240881: several tests are failing due to encoding failures

[serguei.spit...@oracle.com]

Please, review the fix of:   https://bugs.openjdk.java.net/browse/JDK-8240881 Webrev:   http://cr.openjdk.java.net/~sspitsyn/webrevs/2020/8240881-encoding-antidelta/ Summary:   JDK-8240881 is a regression caused by the fix of: https://bugs.openjdk.java.net/browse/JDK-8222489      Webrev: http://cr.openjdk.java.net/~cito/JDK-8222489/webrev.06/      Changeset: http://cr.openjdk.java.net/~cito/JDK-8222489/webrev.06/changeset   The suggested fix is the JDK-8240881 anti-delta.   As a reviewer and sponsor, I apologize for this regression.   The change impact occurred bigger than expected. Testing:   The mac Thanks, Serguei