[llvm] [DAG] computeKnownFPClass - add ISD::SPLAT_VECTOR handling (PR #189529)

[Matt Arsenault via llvm-commits]

================
@@ -6112,6 +6112,12 @@ KnownFPClass SelectionDAG::computeKnownFPClass(SDValue Op,
     }
     break;
   }
+
+  case ISD::SPLAT_VECTOR: {
+      Known = computeKnownFPClass(Op.getOperand(0), InterestedClasses, Depth + 1);
+      break;
----------------
arsenm wrote:

```suggestion
    Known = computeKnownFPClass(Op.getOperand(0), InterestedClasses, Depth + 1);
    break;
```

Indent is off, run clang-format 

https://github.com/llvm/llvm-project/pull/189529