[jdk21u-dev] RFR: 8367372: Test `test/hotspot/jtreg/gc/TestObjectAlignmentCardSize.java` fails on 32 bit systems

[Satyen Subramaniam]

Backporting JDK-8367372: Test test/hotspot/jtreg/gc/TestObjectAlignmentCardSize.java fails on 32 bit systems. Trivial fix to require test only run on 64 bit systems. Ran GHA Sanity Checks and adjusted tests directly on both 64 and 32 bit systems (automatically skipped on the latter). Patch is clean.

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Commit messages:
 - Backport 0f535aeb0ae2f7015300889a0ee9efbf10a15896

Changes: https://git.openjdk.org/jdk21u-dev/pull/2203/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2203&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367372
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2203.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2203/head:pull/2203

PR: https://git.openjdk.org/jdk21u-dev/pull/2203