RFR(S): 8224580: Matcher can cause oop field/array element to be reloaded

[dean.long at oracle.com]

It seems to do what you want, but I'm curious, what's the worse that can 
happen if we call set_shared() on a node that doesn't need it?

dl

On 5/27/19 4:57 AM, Roland Westrelin wrote:
>> The change looks reasonable to me.
>>
>> I have run tests with the patch and can confirm that the original bug
>> went away. I've also run a bunch of other tests and workloads and looks
>> good too.
> Thanks Roman. Anyone else for this?
> Shenandoah needs this for a key change that's also out for review:
>
> https://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2019-May/025931.html
> (8224584: Shenandoah: Eliminate forwarding pointer word)
>
> Roland.