RFR: JDK-8284858: Start of release updates for JDK 20 [v4]

[Joe Darcy]

> Time to start getting ready for JDK 20...

Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 38 additional commits since the last revision:

 - Adjust deprecated options test.
 - Merge branch 'master' into JDK-8284858
 - Update deprecated options test.
 - Merge branch 'master' into JDK-8284858
 - Respond to review feedback.
 - Update symbol information for JDK 19 b24.
 - Merge branch 'master' into JDK-8284858
 - Merge branch 'master' into JDK-8284858
 - Merge branch 'master' into JDK-8284858
 - Merge branch 'master' into JDK-8284858
 - ... and 28 more: https://git.openjdk.java.net/jdk/compare/2ffc9a25...54e872b5

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8236/files
  - new: https://git.openjdk.java.net/jdk/pull/8236/files/eedd36bd..54e872b5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8236&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8236&range=02-03

  Stats: 1101 lines in 21 files changed: 708 ins; 170 del; 223 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8236.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8236/head:pull/8236

PR: https://git.openjdk.java.net/jdk/pull/8236