RFR: JDK-8286666: JEP 429: Implementation of Scoped Values (Incubator) [v34]

[Andrew Haley]

> JEP 429 implementation.

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

  Feedback from reviewers

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10952/files
  - new: https://git.openjdk.org/jdk/pull/10952/files/37441eeb..4f2716a3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10952&range=33
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10952&range=32-33

  Stats: 9 lines in 2 files changed: 5 ins; 1 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