RFR: 8260473: [vector] ZGC: VectorReshape test produces incorrect results with ZGC enabled

[Nils Eliasson]

On Thu, 28 Jan 2021 09:02:22 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> https://bugs.openjdk.java.net/browse/JDK-8260473
>> 
>> Function "PhaseVector::expand_vunbox_node" creates a LoadNode, but forgets to make the LoadNode to pass gc barriers.
>> 
>> 
>> Testing: all Vector API related tests have passed.
>
> What about migrating it to `GraphKit::access_load_at` instead?

@iwanowww GraphKit::access_load_at is for parse time only. C2OptAccess must be used here.

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PR: https://git.openjdk.java.net/jdk/pull/2253