[llvm] [NFC][RISCV] Unify all zvfbfa vl patterns and sd node patterns (PR #171072)

[Craig Topper via llvm-commits]

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@@ -2581,6 +2632,20 @@ foreach fvtiToFWti = AllWidenableFloatVectors in {
                   (fvti.Vector (IMPLICIT_DEF)), fwti.RegClass:$rs1,
                   (fwti.Mask VMV0:$vm), GPR:$vl, fvti.Log2SEW, TA_MA)>;
   }
+
+  // Define vfncvt.f.f.w for bf16 when Zvfbfa is enable.
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topperc wrote:

```suggestion
  // Define vfncvt.f.f.w for bf16 when Zvfbfa is enabled.
```

https://github.com/llvm/llvm-project/pull/171072