[lworld] RFR: 8333675: [lworld] Handling of invalid class files

[Frederic Parain]

Improve detection of invalid class files and test coverage of invalid scenarios.

Tested with Mach5, tier 1 to 3.

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Commit messages:
 - Remove obsolete tests
 - More tests of VM fixing missing ACC_IDENTITY
 - Fix Copyright years
 - Add test checking that VM fixes missing ACC_IDENTITY in old class files
 - Add field tests for abstract value classes
 - Detect missing exception and other fixes
 - Merge remote-tracking branch 'upstream/lworld' into invalid_classes
 - Improve class validation and test coverage

Changes: https://git.openjdk.org/valhalla/pull/1114/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1114&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333675
  Stats: 4582 lines in 10 files changed: 1417 ins; 3143 del; 22 mod
  Patch: https://git.openjdk.org/valhalla/pull/1114.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1114/head:pull/1114

PR: https://git.openjdk.org/valhalla/pull/1114