Verify and reenable testcases related to Backport for JDK-8311964: x86 bug 'unrecognized VM options' (C2 flags)

**Summary**

An upstream bug has been seen in JDK21 (and under) testing at Adoptium.

To solve this, we should request that the fix for that bug be backported.

**Details**

Adoptium test failures were documented [here](https://github.com/adoptium/aqa-tests/issues/4969#issuecomment-1892691485) and [here](https://github.com/adoptium/aqa-tests/issues/4960#issuecomment-1890821702).

These tests were subsequently excluded [here](https://github.com/adoptium/aqa-tests/pull/4965).

These failures look like they were caused by [this OpenJDK bug](https://github.com/openjdk/jdk/pull/14942).

We see that this bug has been fixed, and that the fix was merged into JDK22+.

To solve this problem at Adoptium, a backport was proposed in the [General Retrospective for the Adoptium January 2024 releases](https://github.com/adoptium/temurin/issues/13#issuecomment-1890962636).

Start with the test exclusions in adoptium/aqa-tests#4965 and the failure reports linked from this issue. Compare them with the OpenJDK fix in PR 14942, then verify the affected tests on JDK21 and earlier before re-enabling them. Done means the tests run successfully without the unrecognized VM options failures.

Written by the indexing model from the issue text.