[15] RFR 8241793: Shenandoah: Enable concurrent class unloading for aarch64

[Roman Kennke]

> 
> Hi Stuart,
>>>>
>>>
>>
>> Hi Zhengyu, that looks good to me.
>>
>> Is it necessary for there to be so many clauses for testing this in
>> Shenandoah? I'm wondering whether the different modes are likely to be
>> worthwhile for this testing, given the increase in run time it would add.
> 
> This test is at tier3 (stress tests), so I think it is fine.
> 

It looks good to me.

Thanks,
Roman