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

[Roman Kennke]

>> 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)

FWIW, I've pushed the "8224584: Shenandoah: Eliminate forwarding pointer
word" change, in order to unblock our work. It is really important to
fix this nasty bug though. Can we please get another review from
C2/compiler folks?

Thanks,
Roman

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