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

[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).

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Depends on: https://git.openjdk.org/jdk21u-dev/pull/1037

Commit messages:
 - 8341779: [REDO BACKPORT] type annotations are not visible to javac plugins across compilation boundaries

Changes: https://git.openjdk.org/jdk21u-dev/pull/1251/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1251&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341779
  Stats: 302 lines in 2 files changed: 302 ins; 0 del; 0 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