[jdk16] RFR: 8258505: [TESTBUG] TestDivZeroWithSplitIf.java fails due to missing UnlockDiagnosticVMOptions

[Christian Hagedorn]

Just adding the missing `-XX:+UnlockDiagnosticVMOptions` flag to the test.

Thanks,
Christian

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Commit messages:
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Changes: https://git.openjdk.java.net/jdk16/pull/37/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16&pr=37&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258505
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/37.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/37/head:pull/37

PR: https://git.openjdk.java.net/jdk16/pull/37