RFR: 8287227: Shenandoah: A couple of virtual thread tests failed with iu mode even without Loom enabled.

[Roland Westrelin]

On Thu, 2 Jun 2022 14:39:10 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> With JDK-8277654, the load barrier slow path call doesn't produce raw
>> memory anymore but the IU barrier call still does. I propose removing
>> raw memory for that call too which also causes the assert that fails
>> to be removed.
>
> Is it correct, though? I seem to remember that without the memory edges, we may get reordering of the 'SATB' buffer and index accesses between IU-barriers, which would cause troubles?

@rkennke @shipilev thanks for the review and tests

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PR: https://git.openjdk.org/jdk/pull/8958