[lworld] RFR: 8260375: [lworld] ValueTearing fails with -XX:FlatArrayElementMaxSize=0 -XX:InlineFieldMaxFlatSize=0

[Frederic Parain]

Please review this fix forcing field and array flattening for tests relying on flattening.

Thank you,

Fred

-------------

Commit messages:
 - Force flattening for tests requiring it

Changes: https://git.openjdk.java.net/valhalla/pull/313/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=313&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260375
  Stats: 22 lines in 7 files changed: 2 ins; 0 del; 20 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/313.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/313/head:pull/313

PR: https://git.openjdk.java.net/valhalla/pull/313