RFR: 8257450: Start of release updates for JDK 17 [v5]

[Joe Darcy]

> Start of JDK 17 updates.

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 12 additional commits since the last revision:

 - Merge branch 'master' into JDK-8257450
 - Update symbol files for JDK 16b27.
 - Merge branch 'master' into JDK-8257450
 - Merge branch 'master' into JDK-8257450
 - Merge branch 'master' into JDK-8257450
 - Update tests.
 - Merge branch 'master' into JDK-8257450
 - Merge branch 'JDK-8257450' of https://github.com/jddarcy/jdk into JDK-8257450
 - Merge branch 'JDK-8257450' of https://github.com/jddarcy/jdk into JDK-8257450
 - JDK-8257450
 - ... and 2 more: https://git.openjdk.java.net/jdk/compare/e5462611...ff9b78ec

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1531/files
  - new: https://git.openjdk.java.net/jdk/pull/1531/files/342c8650..ff9b78ec

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1531&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1531&range=03-04

  Stats: 1427 lines in 38 files changed: 1106 ins; 191 del; 130 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1531.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1531/head:pull/1531

PR: https://git.openjdk.java.net/jdk/pull/1531