RFR: Rearrange Shenandoah tests into 3 tiers

[Aleksey Shipilev]

On 06/01/2018 09:14 PM, Roman Kennke wrote:
> Am 01.06.2018 um 20:51 schrieb Zhengyu Gu:
>> Following upstream convention, rearrange Shenandoah tests into 3 tiers.
>>
>> Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/test_groups/webrev.00/
>>
>> Thanks,
>>
>> -Zhengyu
> 
> It's good by me. Make sure Aleksey acks it, he probably needs to update
> his test infra. Or, alternatively, keep hotspot_gc_shenandoah for
> compat. :-)

We don't depend on hotspot_gc_shenandoah all that much, I'll fix that as we go.
Tthe new test split is fine!

-Aleksey