RFR: JDK-8286666: JEP 429: Implementation of Scoped Values (Incubator) [v25]

[Andrew Haley]

> JEP 429 implementation.

Andrew Haley has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 52 commits:

 - Merge master
 - javadoc
 - Feedback from reviewers
 - Update src/hotspot/share/classfile/vmSymbols.hpp
 - Merge branch 'JDK-8286666' of https://github.com/theRealAph/jdk into JDK-8286666
 - Update src/java.base/share/classes/java/lang/VirtualThread.java
   
   Co-authored-by: Alan Bateman <Alan.Bateman at oracle.com>
 - Update src/java.base/share/classes/java/lang/Thread.java
   
   Co-authored-by: ExE Boss <3889017+ExE-Boss at users.noreply.github.com>
 - Update src/hotspot/cpu/aarch64/aarch64.ad
   
   Co-authored-by: ExE Boss <3889017+ExE-Boss at users.noreply.github.com>
 - Feedback from reviewers
 - Remove incorrect assertion.
 - ... and 42 more: https://git.openjdk.org/jdk/compare/2afb4c33...30f150e1

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Changes: https://git.openjdk.org/jdk/pull/10952/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10952&range=24
  Stats: 3332 lines in 61 files changed: 2907 ins; 254 del; 171 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