[lilliput-jdk17u:lilliput] RFR: 8312171: [Lilliput/JDK17] Fix oop array element alignment

[Roman Kennke]

When running with -COOPS, oop array elements need to be 8-byte-aligned. We have this correct in runtime, but not in the SA. Notably, the problem manifests with ZGC.

This is a straight backport of https://github.com/openjdk/lilliput/pull/96.

The problem is already fixed in https://github.com/openjdk/jdk/pull/11044.

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Commit messages:
 - 8312171: [Lilliput/JDK17] Fix oop array element alignment

Changes: https://git.openjdk.org/lilliput-jdk17u/pull/53/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=53&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312171
  Stats: 21 lines in 2 files changed: 12 ins; 7 del; 2 mod
  Patch: https://git.openjdk.org/lilliput-jdk17u/pull/53.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk17u.git pull/53/head:pull/53

PR: https://git.openjdk.org/lilliput-jdk17u/pull/53