[jdk21u-dev] RFR: 8337998: CompletionFailure in getEnclosingType attaching type annotations [v3]

[Liam Miller-Cushon]

> This is a backport of [JDK-8337998](https://bugs.openjdk.org/browse/JDK-8337998), which is a follow-up to [JDK-8225377](https://bugs.openjdk.org/browse/JDK-8225377).

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 nine additional commits since the last revision:

 - Fix merge
 - Merge remote-tracking branch 'origin/master' into backport-JDK-8337998
 - Backport 9e282e5c966a9c065de8b901b7d30bb5c9ccf243
 - Backport 8d0831478338e9b084b2c47f46eba9faae3a5eb6
 - 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/1253/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/1253/files/1abdbdbd..372947bc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1253&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1253&range=01-02

  Stats: 139637 lines in 1870 files changed: 73785 ins; 14273 del; 51579 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1253.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1253/head:pull/1253

PR: https://git.openjdk.org/jdk21u-dev/pull/1253