[jdk23] RFR: 8334488: Improve error for illegal early access from nested class

[Vicente Romero]

clean backport of: JDK-8334488

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Commit messages:
 - 8334488: Improve error for illegal early access from nested class

Changes: https://git.openjdk.org/jdk/pull/19797/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19797&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334488
  Stats: 26 lines in 7 files changed: 21 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/19797.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19797/head:pull/19797

PR: https://git.openjdk.org/jdk/pull/19797