RFR: 8369508: Type annotations on anonymous new class creation expressions can't be retrieved

[Liam Miller-Cushon]

Hi,

Please consider this fix for [JDK-8369508: Type annotations on anonymous new class creation expressions can't be retrieved](https://bugs.openjdk.org/browse/JDK-8369508).

When visiting a type annotation on an anonymous class instantiation expression, javac currently skips attribution of the annotated type when visiting it as part of the `new` expression, to prevent them from being incorrectly attached to the enclosing method instead of the synthetic declaration of the anonymous class (see [JDK-8198945](https://bugs.openjdk.org/browse/JDK-8198945)). However because this logic happens early, and results in skipping attribution of these annotations, they aren't available on the type model elements for the new class creation expression, which means they can't be retrieved by clients of the compiler tree API.

This fix shifts the handling of these annotations later, to allow them to get attributed, but then to still prevent them from being attached to the enclosing method symbol of the anonymous class declaration.

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

Commit messages:
 - Cleanup
 - 8369508: Type annotations on anonymous new class creation expressions can't be retrieved

Changes: https://git.openjdk.org/jdk/pull/27730/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27730&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369508
  Stats: 32 lines in 3 files changed: 11 ins; 13 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/27730.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27730/head:pull/27730

PR: https://git.openjdk.org/jdk/pull/27730