RFR: 8347147: [REDO] AccessFlags can be u2 in metadata

[Coleen Phillimore]

This is the same change that I pushed as commit 098afc8b7d0e7caa82999fb9d4e319ea8aed09a1 but now coordinated with @mur47x111  for the graal changes.

A tier1 sanity test in progress.

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Commit messages:
 - 8347147: [REDO] AccessFlags can be u2 in metadata

Changes: https://git.openjdk.org/jdk/pull/22968/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22968&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347147
  Stats: 328 lines in 58 files changed: 45 ins; 50 del; 233 mod
  Patch: https://git.openjdk.org/jdk/pull/22968.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22968/head:pull/22968

PR: https://git.openjdk.org/jdk/pull/22968