RFR (S) 8215575: C2 crash: assert(get_instanceKlass()->is_loaded()) failed: must be at least loaded

[coleen.phillimore at oracle.com]

Erik,

Thank you for your reply to David and the review and discussion for this 
fix.

Coleen

On 1/8/19 7:22 AM, Erik Österlund wrote:
> Hi Coleen,
>
> Looks good.
>
> /Erik
>
> On 2019-01-07 20:50, coleen.phillimore at oracle.com wrote:
>> Summary: Set InstanceKlass::loaded before adding classes to the 
>> subklass list, which can be read concurrently by the compiler.
>>
>> Thanks to Erik for the diagnosis and suggested fix.  See bug comments 
>> for more details.
>>
>> Tested with hs-tier1-3, 6 and 8.
>>
>> open webrev at http://cr.openjdk.java.net/~coleenp/8215575.01/webrev
>> bug link https://bugs.openjdk.java.net/browse/JDK-8215575
>>
>> Thanks,
>> Coleen
>