[llvm] [RISCV] Initial codegen support for the XRivosVizip extension (PR #131933)

[Luke Lau via llvm-commits]

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@@ -4870,6 +4909,34 @@ static bool isSpreadMask(ArrayRef<int> Mask, unsigned Factor, unsigned &Index) {
   return true;
 }
 
+static SDValue lowerVIZIP(unsigned Opc, SDValue Op0, SDValue Op1,
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lukel97 wrote:

Should this be called lowerVZIP?

https://github.com/llvm/llvm-project/pull/131933