RFR: 8316325: [lw5] sync javac with the current JVMS, particularly assertions on new class attributes

[Vicente Romero]

This PR is implementing assertions on new classfile attributes, see [1]

[1] https://cr.openjdk.org/~dlsmith/jep401/jep401-20230519/specs/flattened-heap-jvms.html

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Commit messages:
 - 8316325: [lw5] sync javac with the current JVMS, particularly assertions on new class attributes

Changes: https://git.openjdk.org/valhalla/pull/927/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=927&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316325
  Stats: 887 lines in 28 files changed: 869 ins; 4 del; 14 mod
  Patch: https://git.openjdk.org/valhalla/pull/927.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/927/head:pull/927

PR: https://git.openjdk.org/valhalla/pull/927