TestHumongousCodeCacheRoots should be excluded on aix

Hi,

during AQA triage, I found a failing test TestHumongousCodeCacheRoots
(for more context see)
https://github.com/adoptium/aqa-tests/issues/5233#issuecomment-2066358363

Looks like the test is looking for a missing VM opt, which is not present on this architecture.
```
[2024-04-17T12:42:33.421Z] STDERR:
[2024-04-17T12:42:33.421Z] stdout: [];
[2024-04-17T12:42:33.421Z] stderr: [Unrecognized option: -client
[2024-04-17T12:42:33.421Z] Error: Could not create the Java Virtual Machine.
[2024-04-17T12:42:33.421Z] Error: A fatal exception has occurred. Program will exit.
[2024-04-17T12:42:33.421Z] ]
```

The test should have been excluded as a part of:
https://github.com/adoptium/aqa-tests/pull/2800/

Specifically:
https://github.com/adoptium/aqa-tests/issues/2818

Thank you!

---
Test case code is here https://github.com/adoptium/jdk8u/blob/master/hotspot/test/gc/g1/TestHumongousCodeCacheRoots.java

Test runs in -server and -client mode. We can check if it ran and passed in -server mode as it may help to know if the upstream testcase can/should be adjusted to better support certain platforms.

Start with hotspot/test/gc/g1/TestHumongousCodeCacheRoots.java and review the exclusion work referenced in pull request 2800 and issue 2818. Check how this test is selected for AIX, verify that it is excluded there, and compare the server-mode result to the reported client-mode failure.

Written by the indexing model from the issue text.