[lilliput-jdk21u:lilliput] RFR: 8315047: [Lilliput/JDK21] Some additions to 8139457: Array bases are aligned at HeapWord granularity

[Roman Kennke]

The original cherry-pick for 8139457 missed a couple of new tests. Also, I'd also bring in some recent updates from the PR (in response to reviews).

Testing:
 - [x] tier1 -CCP
 - [x] tier1 +CCP

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Commit messages:
 - 8315047: [Lilliput/JDK21] Some additions to 8139457: Array bases are aligned at HeapWord granularity

Changes: https://git.openjdk.org/lilliput-jdk21u/pull/2/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput-jdk21u&pr=2&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315047
  Stats: 399 lines in 15 files changed: 349 ins; 33 del; 17 mod
  Patch: https://git.openjdk.org/lilliput-jdk21u/pull/2.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk21u.git pull/2/head:pull/2

PR: https://git.openjdk.org/lilliput-jdk21u/pull/2