[jdk21u-dev] RFR: 8341779: [REDO BACKPORT] type annotations are not visible to javac plugins across compilation boundaries [v4]

[Liam Miller-Cushon]

> [JDK-8341779](https://bugs.openjdk.org/browse/JDK-8341779) is a redo of the backport of [JDK-8323093](https://bugs.openjdk.org/browse/JDK-8323093), see also discussion in CSR [JDK-8346471](https://bugs.openjdk.org/browse/JDK-8346471).

Liam Miller-Cushon has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Merge remote-tracking branch 'origin/master' into redo-JDK-8341779
 - Merge branch 'master' into redo-JDK-8341779
 - 8341779: [REDO BACKPORT] type annotations are not visible to javac plugins across compilation boundaries
 - Merge remote-tracking branch 'origin/master' into backport-JDK-8336942
 - Merge remote-tracking branch 'origin/master' into backport-JDK-8336942
 - 8336942: Improve test coverage for class loading elements with annotations of different retentions
   
   Reviewed-by: vromero

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/1251/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/1251/files/23153afd..7fb771a3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1251&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1251&range=02-03

  Stats: 62133 lines in 527 files changed: 14420 ins; 6097 del; 41616 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1251.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1251/head:pull/1251

PR: https://git.openjdk.org/jdk21u-dev/pull/1251