[lworld] RFR: 8309344: [lworld] Initial ZGenerational fixes and support

[David Simms]

* BarrierSet typo
* Segmented array initialization disabled
* Sanity testing with InlineOops

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Commit messages:
 - 8309344: [lworld] Initial ZGenerational fixes and support

Changes: https://git.openjdk.org/valhalla/pull/890/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=890&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309344
  Stats: 21 lines in 3 files changed: 18 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/valhalla/pull/890.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/890/head:pull/890

PR: https://git.openjdk.org/valhalla/pull/890