[llvm] [VP][RISCV] Add a vp.load.ff intrinsic for fault only first load. (PR #128593)

[Shih-Po Hung via llvm-commits]

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@@ -837,6 +837,14 @@ static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) {
     ID.AddInteger(ELD->getMemOperand()->getFlags());
     break;
   }
+  case ISD::VP_LOAD_FF: {
+    const VPLoadFFSDNode *LD = cast<VPLoadFFSDNode>(N);
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arcbbb wrote:

```suggestion
    const auto *LD = cast<VPLoadFFSDNode>(N);
```

https://github.com/llvm/llvm-project/pull/128593