[vectorIntrinsics+mask] RFR: 8269343: Masked vector arithmetic intrinsics failed to be inlined randomly

[Xiaohong Gong]

On Mon, 28 Jun 2021 18:54:56 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> Looks good.
> 
Thanks for your review @PaulSandoz !

> I am wondering why its not needed on the vector arguments, is that because there is a cast to `{T}Vector` for vector arguments in templates is sufficient in those cases? Or does the `that.check(this);` help as well?
>
I think one reason is the vector class is transfered by calling `this.getClass()` when calling the intrinsic method. And  `that.check(this);` also helps since there is the vector class equalling check inside this method.

I also tried to get the mask class by calling `m.getClass()` like the vector class, but the compiler cannot guarantee the class is a constant which could also make the intrinsic fail to inline. As a reference to the existing `blend` API, it also explicitly set the mask class to the instance of the subclass which is sure to be a constant.

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PR: https://git.openjdk.java.net/panama-vector/pull/96