RFR: 8308727: Compiler should accept final unnamed variables in try-with-resources

[Aggelos Biboudis]

This PR addresses the bug with `final` but also with annotations on local variables within try-with-resources.

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Commit messages:
 - 8308727: Compiler should accept final unnamed variables in try-with-resources

Changes: https://git.openjdk.org/jdk/pull/14130/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14130&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308727
  Stats: 11 lines in 2 files changed: 10 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14130.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14130/head:pull/14130

PR: https://git.openjdk.org/jdk/pull/14130