[lworld] RFR: 8353212: [lworld] TestFlatArrayAliasesCardMark.java crashes when run with -XX:+UseAtomicValueFlattening

[Tobias Hartmann]

Code added by [JDK-8341759](https://bugs.openjdk.org/browse/JDK-8341759) needs to handle fields of type `T_ARRAY`.

Best regards,
Tobias

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Commit messages:
 - 8353212: [lworld] TestFlatArrayAliasesCardMark.java crashes when run with -XX:+UseAtomicValueFlattening

Changes: https://git.openjdk.org/valhalla/pull/1417/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1417&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353212
  Stats: 40 lines in 2 files changed: 39 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1417.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1417/head:pull/1417

PR: https://git.openjdk.org/valhalla/pull/1417