[vectorIntrinsics+mask] RFR: 8264563: Add masked vector intrinsics for binary/store operations [v5]

[Xiaohong Gong]

On Wed, 21 Apr 2021 11:18:32 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> Oh, I just noticed that the `StoreVectorMaskedNode` is extended from `StoreNode`, which has some optimizations in `StoreNode::Ideal`. I'm worried that overriding the `StoreNode::Ideal` for `StoreVectorMaskedNode` might miss the optimizations in `StoreNode::Ideal`. I will reconsider this in more details. Thanks!
>
> It makes sense to handle it separately and fix it in the mainline.

It's ok for me. I will revert this change. Thanks!

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PR: https://git.openjdk.java.net/panama-vector/pull/57