RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v77]

[Per Minborg]

> Implement JEP 502.
> 
> The PR passes tier1-tier3 tests.

Per Minborg has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 370 commits:

 - Revert unwanted changes
 - Merge branch 'master' into implement-jep502
 - Address comments
 - Replace 'contents' with 'result' in the docs
 - Rephrase happens-before clause
 - Replace 'content' with 'contents' and doc updates
 - Merge branch 'master' into implement-jep502
 - Remove section on fun/coll sync
 - Reformat docs
 - Fix failing test (exception message)
 - ... and 360 more: https://git.openjdk.org/jdk/compare/290d24d1...bcc022fe

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Changes: https://git.openjdk.org/jdk/pull/23972/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=76
  Stats: 4807 lines in 30 files changed: 4795 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/23972.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23972/head:pull/23972

PR: https://git.openjdk.org/jdk/pull/23972