RFR (S) 8251336: Shenandoah: assert "only get here when SATB active" after JDK-8244997

[Kim Barrett]

> On Aug 11, 2020, at 9:56 AM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
>> On Aug 11, 2020, at 7:40 AM, Coleen Phillimore <coleen.phillimore at oracle.com> wrote:
>> 
>> Summary: Release OopStorage oops outside a safepoint.
>> 
>> Tested with tier1-6.
>> 
>> open webrev at http://cr.openjdk.java.net/~coleenp/2020/8251336.01/webrev
>> bug link https://bugs.openjdk.java.net/browse/JDK-8251336
>> 
>> Thank you to Zhengyu for alerting me about this issue.
>> 
>> Coleen

BTW, I haven’t actually looked, but I think there’s a good chance this also affects G1.