[jdk16] RFR: 8260473: [vector] ZGC: VectorReshape test produces incorrect results with ZGC enabled

[Jie Fu]

On Sat, 30 Jan 2021 17:33:08 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> Why `-XX:CICompilerCount=1` and `-Xmx256m` are needed?

Thanks @iwanowww for your review.

I discussed the same question with @casparcwang offline.
The reason is:
 - Small heap (-Xmx256m) will help to trigger a gc.
 - compileonly and compilercount=1 will let the VM run slow enough to wait for a gc to be finished.
 
And @casparcwang told me that this bug seems not to be reproduced every time without these JVM args.
Thanks.

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PR: https://git.openjdk.java.net/jdk16/pull/139