[llvm] [RISCV] Model interleave2 and deinterleave2 costs with Zvzip (PR #225752)

[Min-Yih Hsu via llvm-commits]

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@@ -98,3 +120,649 @@ define {<8 x i32>, <8 x i32>} @deinterleave_2_m2_dest(<16 x i32> %v) {
   %res1 = insertvalue {<8 x i32>, <8 x i32>} %res0, <8 x i32> %v1, 1
   ret {<8 x i32>, <8 x i32>} %res1
 }
+
+; Fixed-length interleave2 intrinsics.
+; TODO: we not support the cost calculation of Zvzip in getShuffleCost yet, so
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mshockwave wrote:

"we not support" -> "we haven't supported"?

https://github.com/llvm/llvm-project/pull/225752