RFR: 8341903: Implementation of Scoped Values (Fourth Preview) [v5]

[Andrew Haley]

> The fourth preview of scoped values.

Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:

  API change

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21456/files
  - new: https://git.openjdk.org/jdk/pull/21456/files/052553ea..7ec8e8de

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21456&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21456&range=03-04

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21456.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21456/head:pull/21456

PR: https://git.openjdk.org/jdk/pull/21456