[vectorIntrinsics+mask] RFR: 8266287: Basic mask IR implementation for the Vector API masking feature support [v3]

[Xiaohong Gong]

On Wed, 23 Jun 2021 12:55:02 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> There could be a problem during scalarize_vbox_node if vector type of mask VectorBoxNode is made as TypeVectMask
https://github.com/jatin-bhateja/panama-vector/blob/628dc716b3f171e1b7b62fd1ec452a3d14a04af9/src/hotspot/share/opto/vector.cpp#L212

I think the main issues that I met are related to `VectorUnboxNode` while not `VectorBoxNode`.  BTW, the bottom type of `VectorBoxNode` is the box type while not the vector type. I'm sorry that I cannot see the influence whether the vector type is a `TypeVect` or `TypeVectMask` for it. Could you please kindly elaborate more about this? 

>From my side, setting the `TypeVect` to `VectorBoxNode` might be ok, but how about the `VectorUnboxNode` ? I think they should keep the same with each other?

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PR: https://git.openjdk.java.net/panama-vector/pull/78