[lworld] Integrated: adding forward reference tests

[Vicente Romero]

adding some regression tests

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Commit messages:
 - adding forward reference tests

Changes: https://git.openjdk.org/valhalla/pull/1298/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1298&range=00
  Stats: 32 lines in 1 file changed: 32 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1298.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1298/head:pull/1298

PR: https://git.openjdk.org/valhalla/pull/1298