RFR: 8351565: Implement JEP 502: Stable Values (Preview)

[Per Minborg]

On Mon, 10 Mar 2025 18:11:23 GMT, Per Minborg <pminborg at openjdk.org> wrote:

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

Here are the current benchmarks for Mac M1:


Benchmark                                     Mode  Cnt  Score   Error  Units
StableFunctionBenchmark.function              avgt   10  4.071 ? 0.252  ns/op
StableFunctionBenchmark.stable                avgt   10  4.107 ? 0.065  ns/op
StableFunctionBenchmark.staticIntFunction     avgt   10  2.688 ? 1.647  ns/op
StableFunctionBenchmark.staticStable          avgt   10  1.708 ? 0.278  ns/op
StableIntFunctionBenchmark.intFunction        avgt   10  1.528 ? 0.040  ns/op
StableIntFunctionBenchmark.stable             avgt   10  1.515 ? 0.019  ns/op
StableIntFunctionBenchmark.staticIntFunction  avgt   10  1.047 ? 0.023  ns/op
StableIntFunctionBenchmark.staticStable       avgt   10  1.056 ? 0.045  ns/op
StableSupplierBenchmark.stable                avgt   10  1.411 ? 0.127  ns/op
StableSupplierBenchmark.supplier              avgt   10  1.676 ? 0.055  ns/op
StableValueBenchmark.atomic                   avgt   10  1.404 ? 0.061  ns/op
StableValueBenchmark.dcl                      avgt   10  1.398 ? 0.037  ns/op
StableValueBenchmark.refSupplier              avgt   10  0.498 ? 0.077  ns/op
StableValueBenchmark.stable                   avgt   10  1.406 ? 0.053  ns/op
StableValueBenchmark.stableNull               avgt   10  1.279 ? 0.062  ns/op
StableValueBenchmark.staticAtomic             avgt   10  1.228 ? 0.060  ns/op
StableValueBenchmark.staticDcl                avgt   10  0.342 ? 0.005  ns/op
StableValueBenchmark.staticHolder             avgt   10  0.342 ? 0.006  ns/op
StableValueBenchmark.staticStable             avgt   10  0.348 ? 0.015  ns/op

``

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PR Comment: https://git.openjdk.org/jdk/pull/23972#issuecomment-2713007259