[jdk21u-dev] RFR: 8364235: Fix for JDK-8361447 breaks the alignment requirements for GuardedMemory

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Depends on: https://git.openjdk.org/jdk21u-dev/pull/2179

Commit messages:
 - backport 078d0d4968e26bb7a15417f1c4e891869c69dc6c

Changes: https://git.openjdk.org/jdk21u-dev/pull/2180/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2180&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364235
  Stats: 14 lines in 1 file changed: 8 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2180.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2180/head:pull/2180

PR: https://git.openjdk.org/jdk21u-dev/pull/2180