RFR: 8278171: [vectorapi] Mask incorrectly computed for zero extending cast

[Mai Đặng Quân Anh]

On Wed, 1 Dec 2021 12:03:15 GMT, Mai Đặng Quân Anh <duke at openjdk.java.net> wrote:

> When doing an unsigned upcast, we perform a signed cast followed by a bitwise and operation to clip the extended signed bit. The sign clip mask is currently calculated incorrectly, the correct mask should have the number of least significant bit set equal to the size of the source elements. This patch fixes this trivial issue and adds several tests for zero extension casts.
> 
> Thank you very much.

Thanks a lot for your support and review. Do I need another review here?

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PR: https://git.openjdk.java.net/jdk/pull/6634