RFR: JDK-8286666: JEP 429: Implementation of Scoped Values (Incubator) [v2]

[Andrew Haley]

> JEP 429 implementation.

Andrew Haley has updated the pull request incrementally with two additional commits since the last revision:

 - Update test
 - Reviewer feedback

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/10952/files
  - new: https://git.openjdk.org/jdk/pull/10952/files/0d72ca2f..4bd44d66

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10952&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10952&range=00-01

  Stats: 6 lines in 2 files changed: 0 ins; 3 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/10952.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10952/head:pull/10952

PR: https://git.openjdk.org/jdk/pull/10952