RFR: 8350212: Track source end positions of declarations that support @SuppressWarnings [v4]

[Archie Cobbs]

> This PR is a sub-task split off from [JDK-8224228](https://bugs.openjdk.org/browse/JDK-8224228), which seeks to add `@SuppressWarnings` support for lexical features.
> 
> Lexical features don't know about classes, members or symbols, so their source file positions must be matched to the source file character offset range of the innermost containing `JCModuleDecl`, `JCPackageDecl`, `JCClassDecl`, `JCMethodDecl`, or `JCVariableDecl`. That means we need the end positions of all such declarations to be available.
> 
> The parser doesn't normally store lexical end positions unless explicitly requested, and we don't want to mandate it for performance reasons.
> 
> Instead, we can just add an `int endPos` field to these five AST nodes. This field can be populated as part of the normal parsing of these node types, which already supports the (optional) tracking of end positions.

Archie Cobbs has updated the pull request incrementally with one additional commit since the last revision:

  Refactoring/cleanup for handling of ending positions.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23669/files
  - new: https://git.openjdk.org/jdk/pull/23669/files/0f85a240..01270280

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23669&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23669&range=02-03

  Stats: 308 lines in 12 files changed: 62 ins; 135 del; 111 mod
  Patch: https://git.openjdk.org/jdk/pull/23669.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23669/head:pull/23669

PR: https://git.openjdk.org/jdk/pull/23669