[lworld] RFR: 8357384: [lworld] AnnotationsTests.java fails if UseNullableValueFlattening is enabled by default

[Tobias Hartmann]

Test only checks if `UseNullableValueFlattening` is set via the command line and fails if it's set by default.

Thanks,
Tobias

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Commit messages:
 - 8357384: [lworld] AnnotationsTests.java fails if UseNullableValueFlattening is enabled by default

Changes: https://git.openjdk.org/valhalla/pull/1464/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1464&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357384
  Stats: 16 lines in 1 file changed: 3 ins; 7 del; 6 mod
  Patch: https://git.openjdk.org/valhalla/pull/1464.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1464/head:pull/1464

PR: https://git.openjdk.org/valhalla/pull/1464