[llvm] [RISCV] Add XSfmm pseudo instruction and vset* insertion support (PR #143068)

[Craig Topper via llvm-commits]

================
@@ -255,6 +262,8 @@ struct DemandedFields {
     OS << "TailPolicy=" << TailPolicy << ", ";
     OS << "MaskPolicy=" << MaskPolicy << ", ";
     OS << "VILL=" << VILL;
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topperc wrote:

```suggestion
    OS << "VILL=" << VILL << ", ";
```

https://github.com/llvm/llvm-project/pull/143068