RFR: Roots verification should take the special roots first

[Roman Kennke]

Am 19.02.2018 um 10:29 schrieb Aleksey Shipilev:
> On 02/16/2018 06:34 PM, Aleksey Shipilev wrote:
>> http://cr.openjdk.java.net/~shade/shenandoah/verifier-roots-threadlast/webrev.01/
>>
>> The motivation is in code comment. Need this to debug a failure in sh/jdk8u.
>
> Ping.
>
> -Aleksey
>
>

Looks good.