RFR: 8355492: MissedOptCastII is missing UnlockDiagnosticVMOptions flag

[Marc Chevalier]

As the title says, let's just add the flag! Sorry, my bad.

It now works on my machine.

Thanks,
Marc

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Commit messages:
 - Add UnlockDiagnosticVMOptions to MissedOptCastII

Changes: https://git.openjdk.org/jdk/pull/24849/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24849&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8355492
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24849.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24849/head:pull/24849

PR: https://git.openjdk.org/jdk/pull/24849