[lworld] RFR: 8301720: [lworld] Value class APIs should have javadoc annotation for PreviewFeature [v2]

[Roger Riggs]

> Add the PreviewFeature for value objects and annotate new APIs.
> (Any restrictions on use of the APIs will come later.)

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  Remove unnecessary PreviewFeature attribute

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/819/files
  - new: https://git.openjdk.org/valhalla/pull/819/files/b5b0ffdb..f93f9378

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=819&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=819&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/819.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/819/head:pull/819

PR: https://git.openjdk.org/valhalla/pull/819