RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v31]

[Per Minborg]

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

Per Minborg has updated the pull request incrementally with one additional commit since the last revision:

  Address various comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23972/files
  - new: https://git.openjdk.org/jdk/pull/23972/files/55f2c90e..260086db

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=30
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=29-30

  Stats: 11 lines in 1 file changed: 5 ins; 1 del; 5 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