RFR: 8286941: Add mask IR for partial vector operations for ARM SVE [v2]

[Xiaohong Gong]

On Mon, 13 Jun 2022 18:11:49 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> We have other vectornodes like `VectorMaskCmp` , `MaskAll` and `VectorLoadMask` also needs to append the mask here. Actually most masked vector nodes accept the mask input except for the load/store/gather/scatter. And in future, we may extend this to other normal vector nodes whose vector length is full-size while not partial, since SVE always needs a predicate for most instructions. So the default patch will be used for most vector nodes.
>
> Add comment about that (default is used for most vector nodes) to avoid confusion in a future.

OK, I will add the comment later. Thanks!

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PR: https://git.openjdk.org/jdk/pull/9037