[lworld] RFR: [lworld] Added missing -XX:+EnableValhalla to ClassInitBarrier test

[Tobias Hartmann]

Forgot to push this with https://github.com/openjdk/valhalla/pull/778.

Thanks,
Tobias

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Commit messages:
 - [lworld] Added missing -XX:+EnableValhalla to ClassInitBarrier test

Changes: https://git.openjdk.org/valhalla/pull/781/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=781&range=00
  Stats: 14 lines in 1 file changed: 0 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/valhalla/pull/781.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/781/head:pull/781

PR: https://git.openjdk.org/valhalla/pull/781