RFR: 8321820: TestLoadNIdeal fails on 32-bit because -XX:+UseCompressedOops is not recognized

[Daniel Lundén]

This changeset fixes an issue where `TestLoadNIdeal.java` fails on 32-bit, where `-XX:+UseCompressedOops` is not available.

Changes:
- Only run the test on 64-bit platforms.

### Testing
windows-x64, linux-x64, linux-aarch64, macosx-x64, macosx-aarch64:
- tier1, HotSpot parts of tier2 and tier3

linux-x86 (32-bit)
- tier1

-------------

Commit messages:
 - Require 64-bit for TestLoadNIdeal

Changes: https://git.openjdk.org/jdk/pull/17083/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17083&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321820
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17083.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17083/head:pull/17083

PR: https://git.openjdk.org/jdk/pull/17083