RFR: 8278584: compiler/vectorapi/VectorMaskLoadStoreTest.java failed with "Error: ShouldNotReachHere()" [v2]

[Jie Fu]

On Mon, 13 Dec 2021 05:29:47 GMT, Mai Đặng Quân Anh <duke at openjdk.java.net> wrote:

> Hi, we currently don't have any tests to verify the correctness of the generated code. Also, you could modify the current tests in `jdk/incubator/vector/*VectorTests.java` and `compiler/vectorapi/VectorMaskLoadStoreTest.java` since they are effectively don't do anything regarding compiled codes under normal execution.

Hi @merykitty 
After more experiments, I finally found a way to reproduce this bug without `-Xcomp` and keeping the verification by modifying `compiler/vectorapi/VectorMaskLoadStoreTest.java`.
Please review it.
Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/6808