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

[Vladimir Ivanov]

On Wed, 27 Jan 2021 10:05:56 GMT, 王超 <github.com+25214855+casparcwang 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?

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