RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v60]

[Per Minborg]

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

Per Minborg has updated the pull request incrementally with five additional commits since the last revision:

 - Update src/java.base/share/classes/java/lang/StableValue.java
   
   Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
 - Update test/jdk/java/lang/StableValue/StableMapTest.java
   
   Co-authored-by: Viktor Klang <viktor.klang at oracle.com>
 - Update test/jdk/java/lang/StableValue/StableMapTest.java
   
   Co-authored-by: Viktor Klang <viktor.klang at oracle.com>
 - Update test/jdk/java/lang/StableValue/StableMapTest.java
   
   Co-authored-by: Viktor Klang <viktor.klang at oracle.com>
 - Update test/jdk/java/lang/StableValue/StableMapTest.java
   
   Co-authored-by: Viktor Klang <viktor.klang at oracle.com>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23972/files
  - new: https://git.openjdk.org/jdk/pull/23972/files/58a58ca3..c3fabd68

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=59
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=58-59

  Stats: 16 lines in 2 files changed: 0 ins; 0 del; 16 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