RFR: 8234654: ZGC: Only disarm NMethods when marking/relocating code roots

[erik.osterlund at oracle.com]

Hi Per,

Looks good.

Thanks,
/Erik

On 11/22/19 3:03 PM, Per Liden wrote:
> ZRootIterator will currently always try to disarm on-stack NMethods. 
> Strictly speaking, we should only do this when marking/relocating code 
> roots, not when e.g. iterating the heap.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8234654
> Webrev: http://cr.openjdk.java.net/~pliden/8234654/webrev.0
>
> /Per