[15] RFR 8240917: Shenandoah: Avoid scanning thread code roots twice in all root scanner

[Roman Kennke]

Ok, makes more sense now. Looks good!

Thank you!
Roman

> Oops, copy/paste error, updated:
> 
> http://cr.openjdk.java.net/~zgu/JDK-8240917/webrev.01/
> 
> Reran hotspot_gc_shenandaoh tests
> 
> Thanks,
> 
> -Zhengyu
> 
> On 3/12/20 10:14 AM, Roman Kennke wrote:
>> It's doing the same in both branches, or what am I missing?
>>
>> Roman
>>
>> On 3/12/20 2:23 PM, Zhengyu Gu wrote:
>>> Please review this small enhancement, that avoids scanning thread's code
>>> roots if we scan all code blobs anyway.
>>>
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8240917
>>> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8240917/webrev.00/
>>>
>>>
>>> Test:
>>>    hotspot_gc_shenandoah (fastdebug and release)
>>>
>>> Thanks,
>>>
>>> -Zhengyu
>>>
>>
>