Switch to GA mode for final release.
Update release notes for 8u272 release.
Add backport of JDK-8254177 to update to tzdata 2020b
Require tzdata 2020b due to resource changes in JDK-8254177
Adjust JDK-8062808/PR3548 following constantPool.hpp context change in JDK-8243302
Adjust PR3593 following g1StringDedupTable.cpp context change in JDK-8240124 & JDK-8244955
