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

[Craig Topper via llvm-commits]

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@@ -4611,6 +4613,43 @@ static bool isElementRotate(std::array<std::pair<int, int>, 2> &SrcInfo,
          SrcInfo[1].second - SrcInfo[0].second == (int)NumElts;
 }
 
+static bool isAlternating(std::array<std::pair<int, int>, 2> &SrcInfo,
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topperc wrote:

`const std::array`?

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