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

[Sandhya Viswanathan]

On Tue, 31 Aug 2021 07:42:08 GMT, Ningsheng Jian <njian 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.

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