[vectorIntrinsics] RFR: 8267294: [vector] Fix unsigned comparison crashes on x86 CPUs with UseAVX=1

[Jie Fu]

Hi all,

While I was working on JDK-8267370, Ekaterina Pavlova told me some vector tests crashes in Oracle's CI/CD.
According to the hs_err [1], these crashes just happened on a CPU which doesn't support avx2/3.

So we can easily reproduce the crashes with `-XX:UseAVX=1` on modern x86 CPUs by running the following tests.

jdk/incubator/vector/IntMaxVectorTests.java
jdk/incubator/vector/Int128VectorTests.java
jdk/incubator/vector/Short128VectorTests.java
jdk/incubator/vector/ShortMaxVectorTests.java


Let's fix it.

Testing:
  - vector tests on Linux/x64 with UseAVX={3/2/1/0}

Thanks.
Best regards,
Jie

[1] https://bugs.openjdk.java.net/secure/attachment/94669/hs_err_bug8267294.log

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Commit messages:
 - 8267294: [vector] Fix unsigned comparison crashes on x86 CPUs with UseAVX=1

Changes: https://git.openjdk.java.net/panama-vector/pull/91/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=91&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267294
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/91.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/91/head:pull/91

PR: https://git.openjdk.java.net/panama-vector/pull/91