RFR: 8224228: No way to locally suppress lint warnings in parser/tokenizer or preview features

Wed Jan 22 20:33:31 UTC 2025

This PR updates the `DeferredLintHandler` so that deferred warnings can be registered during parsing, before any `JCTree` nodes have been created, and it uses this new capability to update the `"preview"` and `"text-blocks"` Lint warnings so that they can be suppressed via `@SuppressWarnings` annotations. More details are provided in additional comments.

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

Commit messages:
 - Fixes and cleanups.
 - Merge branch 'master' into JDK-8224228
 - Bug fixes.
 - Merge branch 'master' into JDK-8224228
 - Refactor DeferredLintHandler to handle warnings generated during parsing.

Changes: https://git.openjdk.org/jdk/pull/23237/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23237&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8224228
  Stats: 729 lines in 22 files changed: 504 ins; 34 del; 191 mod
  Patch: https://git.openjdk.org/jdk/pull/23237.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23237/head:pull/23237

PR: https://git.openjdk.org/jdk/pull/23237