[lworld] RFR: 8366270: [lworld] Fix ClassFile AccessFlagsTest

[Chen Liang]

When we read a class file and decode the access flag, we should use the class file's version to decode the flag, so we won't get spurious SUPER and IDENTITY mismatches.

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Commit messages:
 - 8366270

Changes: https://git.openjdk.org/valhalla/pull/2036/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2036&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366270
  Stats: 44 lines in 6 files changed: 28 ins; 1 del; 15 mod
  Patch: https://git.openjdk.org/valhalla/pull/2036.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2036/head:pull/2036

PR: https://git.openjdk.org/valhalla/pull/2036