RFR: 8277090 : jsr166 refresh for jdk19 v2

[Doug Lea]

This is the revised jsr166 refresh for jdk19. See https://bugs.openjdk.java.net/browse/JDK-8285450 and https://bugs.openjdk.java.net/browse/JDK-8277090. Out of caution, this PR removes the unrelated commits from original version.

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

Commit messages:
 - Redoing JDK-8277090 to avoid stray commits

Changes: https://git.openjdk.java.net/jdk/pull/8536/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8536&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277090
  Stats: 3367 lines in 13 files changed: 1731 ins; 645 del; 991 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8536.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8536/head:pull/8536

PR: https://git.openjdk.java.net/jdk/pull/8536