RFR: 8271589: fatal error with variable shift count integer rotate operation.

[Jatin Bhateja]

On Mon, 2 Aug 2021 16:24:20 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> I assume `TestLongVectRotate.java` should be also updated.
> 
> And you need add cases for Long type vector shifts if they can be generated.

Long rotates patterns with variable shifts i.e. Long.rotateLeft/Right(a[i], int_b[i]/ (int) long_b[i]) are not auto-vectorized currently.
Problem is only seen with rotation over integers.  I have kept the changes minimal as suggested earlier.

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PR: https://git.openjdk.java.net/jdk/pull/4956