RFR: 8366178: Implement JEP 526: Lazy Constants (Second Preview) [v27]

[Per Minborg]

> Implement JEP 526: Lazy Constants (Second Preview)
> 
> The lazy list/map implementations are broken out from `ImmutableCollections` to a separate class.
> 
> The old benchmarks are not moved/renamed to allow comparison with previous releases.
> 
> `java.util.Optional` is updated so that its field is annotated with `@Stable`.  This is to allow `Optional` instances to be held in lazy constants and still provide constant folding.

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

  Fix forgotten text about (List|Map)::toString

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27605/files
  - new: https://git.openjdk.org/jdk/pull/27605/files/3c26e095..2d8f98fe

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27605&range=26
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27605&range=25-26

  Stats: 10 lines in 2 files changed: 0 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/27605.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27605/head:pull/27605

PR: https://git.openjdk.org/jdk/pull/27605