RFR: 8277090 : jsr166 refresh for jdk19 [v2]

[Doug Lea]

> This is the jsr166 refresh for jdk19. See https://bugs.openjdk.java.net/browse/JDK-8285450 and https://bugs.openjdk.java.net/browse/JDK-8277090

Doug Lea has updated the pull request incrementally with one additional commit since the last revision:

  Address review comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8490/files
  - new: https://git.openjdk.java.net/jdk/pull/8490/files/501a21e8..c3901b45

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8490&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8490&range=00-01

  Stats: 40 lines in 4 files changed: 18 ins; 3 del; 19 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8490.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8490/head:pull/8490

PR: https://git.openjdk.java.net/jdk/pull/8490