RFR: 8272413: Incorrect num of element count calculation for vector cast

[Wu Yan]

On Wed, 18 Aug 2021 08:31:47 GMT, Wang Huang <whuang at openjdk.org> wrote:

> Dear all, 
> Closed JDK-8265244 has split into two issues : JDK-8268966 and this issue. During this issue, I will fix the mid-end comparsion.
> This patch is easy to understand.  It is split from https://github.com/openjdk/jdk/pull/3507. I only fix the mid-end problem because the back-end problem has fixed in JDK-8268966 by @theRealELiu .
> Thank you for your review. 
> 
> Yours,
> WANG Huang

Could you do me a favor to review the patch? @theRealAph @nick-arm Thank you.

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PR: https://git.openjdk.java.net/jdk/pull/5160