[llvm] [RISCV] Change vector tuple type's TypeSize to scalable (PR #114329)

[Craig Topper via llvm-commits]

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@@ -22,6 +22,11 @@ LLT::LLT(MVT VT) {
     init(/*IsPointer=*/false, asVector, /*IsScalar=*/!asVector,
          VT.getVectorElementCount(), VT.getVectorElementType().getSizeInBits(),
          /*AddressSpace=*/0);
+  } else if (VT.isRISCVVectorTuple()) {
+    // TODO: Correctly model RISC-V vector tuple type
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topperc wrote:

Setting IsScalar = true seems wrong thought it was the old behavior. What if we use the final else that sets all fields to `false` or `0`?

https://github.com/llvm/llvm-project/pull/114329