[vectorIntrinsics+mask] RFR: 8273159: Remove LoadVectorMaskNode/StoreVectorMaskNode

[Ningsheng Jian]

On Wed, 1 Sep 2021 17:06:45 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> Removed the nodes and related code. Try to generate the SVE ld1b/st1b extend/narrow instructions by matching specific rules.
>
> Shared code changes look good to me.

Thank you @sviswa7!

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PR: https://git.openjdk.java.net/panama-vector/pull/116